First slide

The lens

Question

A converging lens is used to form an image on a screen. When upper half of the lens is covered by an opaque screen

Easy

A

Half the image will disappear
B

Complete image will be formed of same intensity
C

Half image will be formed of same intensity
D

Complete image will be formed of decreased intensity

Solution

Because to form the complete image only two rays are to be passed through the lens and moreover, since the total amount of light released by the object is not passing through the lens, therefore image is faint (intensity is decreased).

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