Optics 1 Question 5

5. A ray of light travelling in the direction 12(i^+3j^) is incident on a plane mirror. After reflection, it travels along the direction 12(i^3j^). The angle of incidence is

(a) 30

(b) 45

(c) 60

(d) 75

(2013 Adv.)

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Answer:

Correct Answer: 5. (a)

Solution:

tani=1/23/2=13

i=30



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