A photograph of the moon was taken with a tel | vedclass

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(B) When a housefly sits on the objective lens, it does not form a distinct image of the fly on the photograph because the lens is focused on a distan

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There is a reduction in the intensity of the image.

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(B) When a housefly sits on the objective lens, it does not form a distinct image of the fly on the photograph because the lens is focused on a distant object (the moon).Instead, the housefly acts as an obstacle that partially blocks the light entering the telescope.This reduces the effective aperture of the objective lens.Since the intensity of the image formed by an optical system is directly proportional to the area of the aperture $(I \propto A)$, a reduction in the aperture area leads to a reduction in the intensity of the final image.

$A$ photograph of the moon was taken with a telescope. Later on, it was found that a housefly was sitting on the objective lens of the telescope. In the photograph:

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