Question

Question :-

1. A light ray strikes a reflective plane surface at an angle of 56° with the surface.
a) Find the angle of incidence.
b) Find the angle of reflection.
c) Find the angle made by the reflected ray and the surface.
d) Find the angle made by the incident and reflected rays.



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Answer 1

Answer:

(a) The angle of incidence is 34°.

(b) The angle of reflection is 34°.

(c) The angle made by the reflected ray on the surface is 56°.

(d) The angle made by the incident ray and the reflected ray is 68°.

Explanation:

Referred to the attachment for the diagram.

a) Angle of incidence (i) = (90°-56°)

= 34°

So, the angle of incidence is 34°.

b) We know that angle of incidence is equal to the angle of reflection.

Hence, we get

Angle of reflection (r) = 34°.

c) Angle of reflection (r) = 34°.

So, the angle made by the reflected ray on the surface _

(90°-34°)

= 56°.

So, the angle made by the reflected ray on the surface is 56°.

d) Angle of incidence = 34°.

Angle of reflection = 34°.

The angle made by the incident ray and the reflected ray _

(34°+34°)

= 68°.

So, the angle made by the incident ray and the reflected ray is 68°.

Answer 2

Answer:

We use the diagram shown below to answer the questions.

a) angle of incidence: i = 90 - 56 = 34 °

b) angle of reflection r = i = 34 ° (by the law of reflection)

c) q = 90 - r = 90 - 34 = 56 °

d) i + r = 34 + 34 = 68 °