1.

Two plane mirrors are inclined at an angle of 75º. A ray of light is incident on one of the mirrors.The ray undergo total deviation of​

Answer»

Answer:

◆ Answer -

Total deviation of light ray = 140°

● Explanation -

Given that 2 plane mirrors are inclined at an angle75 degree. SUPPOSE a ray of light is INCIDENT on 1st MIRROR at angle i. Hence, deviation at 1st mirror is 2i. Now this ray will INCIDE on 2nd mirror at angle75-i. So deviation at 2nd mirror is 2(75-i) = 140-2i. Hence, total deviation of light ray will be 2i + 140-02i = 140°.

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