Ray Optics and Optical Instruments - Result Question 3

3. Two plane mirrors are inclined at 70. A ray incident on one mirror at angle θ after reflection falls on second mirror and is reflected from there parallel to first mirror. The value of θ is

(a) 50

(b) 45

(c) 30

(d) 55

[NEET Kar. 2013]

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Answer:

Correct Answer: 3. (a)

Solution:

  1. (a)

From fig. 40+θ=90θ=9040=50



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