Question

A ray of light is making an angle o with the surface of a plane mirror. If the angle between the incident and reflected rays is 80°, what is the value of angle Ꮎ

Explanation needed for class 7​

Answer 1

Explanation:

given : ∠i+∠r=80

0

Solution: ∠i+∠r=80

0

→(1)

and for a plane mirror

∠i=∠r →(2)

then from (1) and (2)

2∠i=80

0

∠i=40

0

Hence

Hence from the figure θ+40

0

=90

0

Hence θ=50

0