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1)

A ray of light travelling in the direction   12(ˆi+3ˆj)  is inciodent on a plane mirror. after reflection, it travels along the  direction   12(ˆi3ˆj)  . The angle of incidence is 


A) 300

B) 450

C) 600

D) 750

Answer:

Option A

Explanation:

Component along the plane=1/2  and component perpendicular to the plane = 32

      tani=(12)(32)=13

      i= 300   = angle of incidence