Question

If the angle of incidence is 60°then the angle between the incident ray and reflected ray will be

a)60°
b)30°
c)90°
d)120°​

Answer 1

The correct answer will be option d.

The law of reflection:

1) The incident ray, normal, and the reflected ray lie in the same plane.

2)The angle of reflection of equal to the angle of incidence.

The answer to the question can be given on the basis of the second law.

The ray is incident at an an angle of 60°. This means the angle between normal and incident ray is 60°.

So, the angle of reflection will also be 60°.

Therefore, the angle between the incident ray and the reflected ray will be 120°.

Answer 2

Answer:

given : angle of incidence ( i ) = $60^{0}$

According to law of reflection:

1) The incident ray, normal, and the reflected ray lie in the same plane.

2)The angle of reflection of equal to the angle of incidence.

Hence we conclude that ,

∴ Li = $60^{0}$

we have to find angle between incident ray and reflected ray ,i.e. i + r = ?

i = r            ------------------(law of reflection )

r = $60^{0}$                ----------------- ( ∵ i = $60^{0}$)

∴ i + r =  $60^{0}$ + $60^{0}$

         = $120^{0}$

hence option ' d ' is the correct option.