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A fly is sitting on the objective of a telescope. What will be its effect on the final image of the distant object?

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in Physics – Class 12 by (135k points)
A fly is sitting on the objective of a telescope. What will be its effect on the final image of the distant object?

(a) Reduces

(b) Increases

(c) Remains constant

(d) Indefinite

This question was addressed to me during an online exam.

Question is from Optical Instruments topic in chapter Ray Optics and Optical Instruments of Physics – Class 12

1 Answer

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Best answer
Right option is (a) Reduces

Explanation: The fly will not be seen in the final image. But the intensity of the final image gets reduced because light will not enter the telescope from that part of the object where the fly is sitting. Therefore, a reduction effect will be observed in the final image of the fly.

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