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11.Dual Nature of Radiation and matter
hard
A convex lens of focal length $40 \mathrm{~cm}$ forms an image of an extended source of light on a photoelectric cell. A current I is produced. The lens is replaced by another convex lens having the same diameter but focal length $20 \mathrm{~cm}$. The photoelectric current now is:
A
$\frac{I}{2}$
B
$4$ $ I$
C
$2 \ \mathrm{I}$
D
$ I$
(JEE MAIN-2024)
Solution
As amount of energy incident on cell is same so current will remain same.
Standard 12
Physics
