In a reflecting periscope , if a light ray is incident at `45^(@)` angle at the first plane mirror, then the angle of deviation

In a reflecting periscope , if a light ray is incident at `45^(@)` angle at the first plane mirror, then the angle of deviation of light ray by the periscope is ______ .
A. `30^(@)`
B. `90^(@)`
C. `180^(@)`
D. zero

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In a reflecting periscope , if a light ray is incident at `45^(@)` angle at the first plane mirror, then the angle of deviation of light ray by the pe

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