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Light — Science STD 8 — Question

Gujarat BoardEnglish MediumSTD 8ScienceLight1 Mark
MCQ
In a periscope, how are the reflecting mirrors arranged?
  • A
    Perpendicular to each other.
  • ✓
    Parallel to each other.
  • C
    At an angle of $90^\circ.$
  • D
    At an angle of $60^\circ.$
✓

Answer

Correct option: B.
Parallel to each other.
The two reflecting, plane mirrors arranged in a periscope are parallel to each other. The light ray from the object is incident on the first plane mirror at an angle of $45^\circ$ and the reflected ray is incident on the second mirror at $45^\circ$ and is then reflected at $45^\circ$, which finally reaches the retina of the eye.

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