Recent questions tagged optical-instruments

Description : How the light signal is transmitted through the fiber?

Last Answer : Ans. There are three major parts: 1. Transmitter: it converts electrical signal into light signals 2. Optical fiber: it carries the signal from one place to another 3. Receiver: it converts light signal into ... represented by 0 . Any information can be represented by the pattern of 1's and 0's.

Description : If a person looking through microscope at the full moon, how would the appearance of moon be changed by covering of objective lens?

Last Answer : Ans. He will observe the full image but its brightness will be reduced. In other word, the intensity of light will decreased.

Description : One can buy cheap microscope for use of children. The images seen in such microscope have colored edges, why is this so?

Last Answer : Ans. The images in microscope have colored edges because of defects in lenses. Such a defect is known as chromatic aberration. In such a problem, a lens can’t bring all rays of white light to a single point on image. So image is not sharp and has colored edges.

Description : Why would it be advantages to use blue light with compound microscope?

Last Answer : Ans. The limit, to which a microscope can be used to resolve details, depends upon the width of the objective. A wider objective and use of blue light (short wavelength) produces less diffraction and allows more details to be viewed.

Description : Explain the difference between the angular magnification and resolving power of optical instrument. What limits the magnification of an optical instrument?

Last Answer : Angular magnification: The ratio of the angle subtended by the image as seen through the optical device to that subtended by the object at the un-aided eye Resolving Power: It is the ... object under examination. The magnification of an optical instrument is limited due to defects in lenses.

Description : What do you understand by linear magnification and angular magnification? Explain how a convex lens is used as a magnifier?

Last Answer : Linear Magnification: The ratio of the size of image to the size of object is called linear magnification. Angular magnification: The ratio of the angle subtended by the image as seen through the optical ... lens used as a magnifier when an object is brought within the focal length of convex lens.