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Solution


Q.

A convex lens of focal length 40 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 cm. The photoelectric current now is         [2024]
1 I2  
2 4I  
3 2I  
4 I  

Ans.

(4)         

As amount of energy incident on cell is same so current will remain same.