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Telescopes

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Question

While viewing a distant object with telescope a housefly sits on objective lens. Then which of the following is the correct statement :

A

housefly will be seen enlarged in image

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B

housefly will be seen reduced in image

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C

intensity of image will be decreased

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D

intensity of image will be increased

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Solution

The correct option is C intensity of image will be decreased
When housefly sits on the objective lens, light intensity will fall at objective because housefly will stop the light to fall on the objective. So, intensity of the image is decreased. Hence correct option is C.

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