Question

N
Find the values of angle i, angle r in the dia-
gram.
( )
A) angle i = 60°, angle r = 60°
li
B) angle i= 60°, angle r = 30°
C) angle i = 30°, angle r = 60°
D) angle i = 30°, angle r = 30°
​

Answer 1

● Points before solving:-

1. angle is always measured from the normal to the incident ray
2. angle i =angle r (acc to laws of reflection)

Now mark angle i....

90°-60° = 30°

<i=30°

<r=30°...

so its option D