Description : When beam of parallel rays of light falls on _______ then all the rays of light converge . a) convex lens b)concave lens c)plain mirror d)plano concave lens
Last Answer : a) convex lens
Description : A compound lens is made of two lenses having powers `+15.5 D` and `-5.5D`. An object of 3cm height is placed at a distance of 30 cm from this compound
Last Answer : A compound lens is made of two lenses having powers `+15.5 D` and `-5.5D`. An object of ... cm from this compound lens. Find the size of the image.
Description : The standard length for square or flat key in terms of shaft diameter (D) is, (A) d (B) 2d (C) 1.5d (D) 2.5d
Last Answer : (C) 1.5d
Description : For end bearing piles, the minimum spacing of piles of diameter ‘d’ shall be a) 3d b) 2d c) 2.5d* d) 5d
Last Answer : c) 2.5d*
Description : What is the focal length of a +5d capable lens ?
Last Answer : We know that power is P = 1 / f hence the distance distance f = 1 / p = 1/5 = 0.2 m
Description : A perfectly spherical bubble of air is suspended in a tank of water. A beam of light consisting of parallel rays passes through the bubble. As the light emerges from the opposite side of the bubble the light rays: w) diverge x) converge y) are unaffected
Last Answer : ANSWER: W -- DIVERGE
Description : Lens Power - What Does 2D Mean ?
Last Answer : The power of the lens -2D means the lens is concave and its focal length is 1/2 meter.
Description : What is the power of a lens + 2D ?
Last Answer : If the power of a lens is + 2D then the lens is a convex lens. This is because the power of a convex lens is always positive (+).
Description : Which northern Nigeria city is the centre on which the major caravan routes converge?
Last Answer : Answer: Kano.
Description : An object is placed beyond 2F, in front of a convex lens, image will be formed : (a) between F and 2F (b) at focus (c) at the centre of curvature (d) between focus and Optical centre
Last Answer : (a) between F and 2F
Description : If f1 and f2 are the distances from the optical centre of a convex lens of focal length to conjugate two points P1 and P2 respectively, the following relationship holds good (A) f = f1 + f2 (B) f = ½ (f1 + f2) (C) 1/f = 1/f1 + 1/f2 (D) None of these
Last Answer : (C) 1/f = 1/f1 + 1/f2
Description : When object is placed _______ in front of convex lens than image formed is virtual, erect, magnified and on same side beyond F . a) between optical centre and F b)At F c)between F and 2F d)2F
Last Answer : a) between optical centre and F
Description : Pick up the correct statement from the following: (A) In astronomical telescope, the rays from the object after refraction at the objective are brought to a focus before entering the eyepiece to produce ... the objective traversing through the eyepiece, is called line of sight (D) All the above
Last Answer : (D) All the above
Description : A convex lens has a focal length of 10 cm. At what distance from the lens should the object be placed so that it forms a real and inverted image 20 cm away from the lens? What would be the size of ... ? With the help of a ray diagram show the formation of the image by the lens in this case. -Physics
Last Answer : This is the Answe:
Description : A positive lens with a focal length of 10 cm forms a real image of an object 20 am away from the lens. How far is the real image from the lens? a. 5 cm b. 10 cm c. 15 cm d. 20 cm
Last Answer : d. 20 cm
Description : In a telescope the object glass of focal length 14 cm, is located at 20 cm from the diaphragm. The focussing lens is midway between them when a staff 16.50 m away is focussed. The focal length of the focussing lens, is (A) 5.24 cm (B) 6.24 cm (C) 7.24 cm (D) 8.24 cm
Last Answer : (C) 7.24 cm
Description : A positive lens with a focal length of 10 cm forms a real image of an object 20 am away from the lens. How far is the real image from the lens? ∙ a. 5 cm ∙ b. 10 cm ∙ c. 15 cm ∙ d. 20 cm
Last Answer : ∙ d. 20 cm
Description : A convex lens is placed on an optical bench and is moved till it gives a real image of an object at a minimum distance of 80 cm from the latter. Find
Last Answer : A convex lens is placed on an optical bench and is moved till it gives a real image of an object ... cm from the lens, find the position of the image.
Description : A concave lens is placed in the path of convergent rays. The rays are focussed on the axis 15 cm behind the lens. Where would these rays have been foc
Last Answer : A concave lens is placed in the path of convergent rays. The rays are focussed on the axis 15 cm behind ... lens ? Focal length of the lens is 30 cm.
Description : The distance between a convex lens and a plane mirror is 15 cm. The parallel rays incident on the convex lens, after reflection from the mirror, form
Last Answer : The distance between a convex lens and a plane mirror is 15 cm. The parallel rays incident on the ... and find out the focal length of the lens.
Description : The setting sun often looks oval in the shape because of-----? A. The fact that sun really becomes oval in the evening B. Refraction of rays of sun passing through the atmosphere (Answer) C. Optical Illusion D. Dispersion
Last Answer : B. Refraction of rays of sun passing through the atmosphere (Answer)
Description : The power of a convex lens is +2.5. Then its focal length is (a) 20 cm (b) 50 cm (c) 30 cm (d) 40 cm
Last Answer : Ans:(d)
Description : What is the power of a convex lens with a focal length of 20 cm ?
Last Answer : 20cm = 0.2 m We know , power p = 1 / f = 1 / 0.2 = + 5 D
Description : Mark the correct option a) Branch lines which radiate from head offices and large sub-offices connecting them with less important sub and branch offices in the interior of districts, or lines which ... unbridged streams and rivers, and for carrying them over difficult roads. d) All the above
Last Answer : d) All the above
Description : True meridians are generally preferred to magnetic meridians because (A) These converge to a point (B) These change due to change in time (C) These remain constant (D) None of these
Last Answer : (C) These remain constant
Description : 10. An object 5 cm in length is held 25 cm away from a converging lens of focal length 10 cm. Draw the ray diagram and find the position, size and the nature of the image formed. -Physics-10
Last Answer : Height of the Object, h0 = 5 cm Distance of the object from converging lens, u = -25 cm Focal length of a converging lens, f = 10 cm Using lens formula, Thus, the image is inverted and formed at a distance of 16.7 cm behind the lens and measures 3.3 cm. The ray diagram is shown below.
Description : Consider the Assertion-I and Assertion-II and select the right code given below : Assertion-I : Even Bank-lockers are not safe. Thieves can break them and take away your wealth. But thieves cannot go ... is an argument but the assertion-I is not. (D) Both the assertions are explanations of facts.
Last Answer : (B) The assertion-I is an argument but the assertion-II is not.
Description : Pick up the correct specification of Ramsden eyepiece from the following: (A) It consists of two equal piano convex lenses (B) The curved surfaces of Plano-convex lenses face each other (C) ... from a point on the diaphragm enter the eye as a parallel beam (D) All the above
Description : The defect of a lens whereby rays of white light proceeding from a point get dispersed into their components and conveyed to various foci, forming a blurred and coloured image is known as (A) Chromatic aberration (B) Spherical aberration (C) Astigmatism (D) Coma
Last Answer : (A) Chromatic aberration
Description : A far-sighted person has a near point at 100 cm. What must be the power of the correcting lens? -General Knowledge
Last Answer : Power of the lens = To calculate focal length using the near point=100cm f= Where, u= object size v= image size ∵ image is virtual, it is with a - sign. The near point of a normal eye=u=25 cm Using this, f= = +33.3 cm=+ Also, Power=P= where f is in meters ⇒P=+ = + 3 D
Description : A far-sighted person has a near point at 100 cm. What must be the power of the correcting lens?
Last Answer : +3.0 D
Description : 2. An object 50 cm tall is placed on the principal axis of a convex lens. Its 20 cm tall image is formed on the screen placed at a distance of 10 cm from the lens. Calculate the focal length of the lens. [All India] -Chemistry-10
Last Answer : this is the answer for the respected question
Description : An object 50 cm tall is placed on the principal axis of a convex lens. Its 20 cm tall image is formed on the screen placed at a distance of 10 cm from the lens. Calculate the focal length of the lens. -Physics
Last Answer : The focal length' of convex length is 7.14 cm. Solution: The given quantities are Height of the object h = 50 cm Height of the image formed h' = -20 cm Image distance v = 10 cm The image ... object distance will be So the focal length will be Thus the focal length of the convex lens is 7.14 cm
Description : The radii of curvature of each surface of a convex lens is `20 cm` and the refractive index of the material of the lens is `3//2` (i) Calculate its fo
Last Answer : The radii of curvature of each surface of a convex lens is `20 cm` and the refractive index of the ... What happens if the lens is cut along `CD` ?
Description : The focal length of a concave-convex lens of radii of curvature 5 cm and 10 cm is 20 cm. what will be its focal length in water ? Given `.^(a)mu_(w) =
Last Answer : The focal length of a concave-convex lens of radii of curvature 5 cm and 10 cm is 20 cm. what will be its ... water ? Given `.^(a)mu_(w) = 4//3`.
Description : Do you think I can get the same quality of photos from a Canon 7d compared to the 5d?
Last Answer : answer:Are you an experienced photographer or just learning? I am a learner' myself and one day would love to own a really brilliant camera, but for now I think I need to focus on learning ... and take lots of photos. I will be interested in what more experienced photographers have to say though.
Description : How do you draw 4D, 5D, 6D hypercubes not topologically correct?
Last Answer : Going from one dimension to the next is an iterative process. Start in zero dimensions with a point. To go from zero dimensions to one dimension, take two points and join them with a segment. ... , though it would be difficult to visualize. The number of points doubles each time. Wikipedia article.
Description : What are some fun/special pieces of equipment to use with a Canon 5D Mark II?
Last Answer : answer:You have just entered an amazing world! The 5d MkII is amazing fun and a great tool. You definitely will want to take care of audio and stabilization for video. Audio: Get a Rode Shotgun ... work: http://atelierpictures.com/info/equipment-we-use Let me know if you have any other questions!
Description : What are the differences between the Canon 5D Mark II and the 7D, besides price?
Last Answer : answer:The 5D Mark II has a 21.1 megapixel full-frame sensor The 7D has an 18 megapixel APS-C size CMOS sensor. That full-frame sensor is the key reason the 5D costs so much more. Produces higher quality images.
Description : 4/5d= 32?
Last Answer : 4/5d=32We move all terms to the left:4/5d-(32)=0Domain of the equation: 5d!=0d!=0/5d!=0d∈RWe multiply all the terms by the denominator-32*5d+4=0Wy multiply elements-160d+4=0We move all terms containing d to the left, all other terms to the right-160d=-4d=-4/-160d=1/40
Description : 5D What kind of number ?
Last Answer : 5D is the hexadecimal number. Because 2 numbers and letters have been used in the number , namely 5 and D. Of the four types of number systems, only hexadecimal number systems use such numbers and ... 6 letters of the English capital letter. So it is clear that the number of 5D hexadecimal methods.
Description : Parcel (Max 4 Kg) rate is a) First 500 gm -19 b) Addl 500 gm- 16 c) Home delivery fee above 5 kg- Rs 5d) All are correct
Last Answer : d) All are correct
Description : The soil contains —- % organic matter a. 25 b. 58 c. 5 d. 65
Last Answer : c. 5
Description : 1. A concave lens has focal length of 20 cm. At what distance from the lens a 5 cm tall object be placed so that it forms an image at 15 cm from the lens? Also calculate the size of the image formed. [Delhi] -Chemistry-10
Last Answer : Answer. hope this helps youu
Description : A concave lens has focal length of 20 cm. At what distance from the lens a 5 cm tall object be placed so that it forms an image at 15 cm from the lens? Also calculate the size of the image formed. -Physics
Last Answer : Answer. I hope it helped you.
Description : A source of light and a screen are placed 90 cm apart. Where should a convex lens of 20 cm focal length be placed in order to form a real image of the
Last Answer : A source of light and a screen are placed 90 cm apart. Where should a convex lens of 20 cm focal ... form a real image of the source on the screen ?
Description : A concave lens is kept in contact with a convex lens of focal length `20 cm`. The combination works as a converging lens of focal length `100 cm`. Cal
Last Answer : A concave lens is kept in contact with a convex lens of focal length `20 cm`. The combination ... length `100 cm`. Calculate power of concave lens.
Description : Where should an object be placed from a converging lens of focal length 20 cm, so as to obtain a real image of magnification 2?
Last Answer : Where should an object be placed from a converging lens of focal length 20 cm, so as to obtain a real image of magnification 2?
Description : The focal length of a plano-convex lens is 20 cm in air. Refractive index of glass is 1.5. Calculate (i) the radius of curvature of lens surface and (
Last Answer : The focal length of a plano-convex lens is 20 cm in air. Refractive index of glass is 1.5. ... length when immersed in liquid of refractive index 1.6
Description : A double convex lens has radii 20 cm. The index of refraction of glass is 1.5. Compute the focal length of this lens in air and when immersed in carbo
Last Answer : A double convex lens has radii 20 cm. The index of refraction of glass is 1.5. Compute ... immersed in carbon disulphide of refractive index 1.63.