A thick plane mirror shows a number of images of the filament of an electric bulb. Of these, the brightest image is the:

First

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Second

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Last

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Fourth

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Solution

The correct option is B Second
A thick plane mirror forms a number of images of the filament of an electric bulb. Images formed by the front surface which is unpolished reflect only a small part of the light (say $10 %$ ), while the second image is formed by the polished surface which reflects most of the intensity ($90\%). Hence the second image is the brightest. The intensity of the next reflections will keep on decreasing.

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