When a light ray is reflected repeatedly by a set of parallel plane mirrors, the intensity of light rays decreases after some reflections. This is because of

Poor reflection from mirrors

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Absorption of some amount of light by mirrors

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Dispersion of light when the rays travel through the atmosphere

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Scattering of light by the mirrors

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Solution

The correct option is B Absorption of some amount of light by mirrors
The intensity of the light is decreased because no surface is perfectly reflecting surface. When the light is incident on a reflecting surface some part of the light is observed, resulting in decrease in the intensity.

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