Questions
An image of sun is formed by a lens of focal length 30 cm on the metal surface of a photoelectric cell and it produces a current I. The lens forming the image is then replaced by another lens of same diameter but of focal length 15 cm. The photocurrent in this case will be : (In both case plate is kept at focal plane)
detailed solution
Correct option is C
Number of photons falling per unit time doesn’t change.Talk to our academic expert!
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A photo cell is illuminated by a small bright source placed at 1m away. When the same source of light is placed 2m away, which of the following is true about the electrons emitted by the photo cathode?
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