If the focal spot to film distance is increased from 20cm to 40cm, the intensity of radiation is reduced by: a. ½ b. ¼ . c. 1/3 d. 1/5

If the focal spot to film distance is increased from 20cm to 40cm, the
intensity of radiation is reduced by:
 a. ½
 b. ¼ .
 c. 1/3
 d. 1/5
by

1 Answer

Answer :

b. ¼ .
by

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