An image of the 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 the same diameter but of focal length of 15 cm. The photoelectric current in this case will be - (In both cases the plate is kept at focal plane and normal to the axis lens)

I

The phenomenon of metals releasing electrons when they are exposed to the light of the appropriate frequency is called the photoelectric effect, and the electrons emitted during the process are called photoelectrons.

For a light of any given frequency, the photoelectric current is directly proportional to the intensity of light

As the diameter of the lens remains the same, both the lens will collect the same amount of light. Therefore, the intensity of the light will remain the same.

As a result, the photoelectric current will also remain the same. i.e., I.