1.

An image of the sun is formed by a lens of focal length of 30 cm on the metal surface of a photoelectric cell and a photoelectric current I is produced. The lens forming the image is then replaced by another of the same diameter but of focal length 15 cm. The photoelectric current in this case is                                                     [Manipal MEE 1995]

A.            \[\frac{I}{2}\]                       
B.            I
C.            2I   
D.            4I
Answer» E.


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