Reflected rays strike the second mirror in periscope at an angle of:

45^{o}

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90^{o}

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180^{o}

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60^{o}

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Solution

The correct option is D $45^{o}$
In periscopes, the parallel rays which enter the cylindrical tube from the upper end, from an object, strike the plane mirror at an angle of $45^{o}$ and hence are reflected through an angle of $45^{o}$ .
These reflected rays strike the second mirror at an angle of $45^{o}$ and are further reflected through an angle of $45^{o}$ .

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