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Intro to Thin Lenses

A converging ...

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

A

Half the image will disappear

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B

Complete image will be formed of same intensity

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C

Half image will be formed of same intensity

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D

Complete image will be formed of decreased intensity

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Solution

The correct option is D Complete image will be formed of decreased intensity
To form the complete image only two rays are to be passed through the lens. Moreover the total amount of light released by the object is not passing through the lens because of the covering. Therefore the intensity of the image will be reduced and the image formed will be faint, not sharp.

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