Question

A light ray strikes a plane mirror at an angle of 20 degrees to the normal. What is the angle of the reflected light ray to the normal?

20 degrees

0 degrees

40 degrees

70 degrees

Answer 1

20 degrees

Step-by-step explanation:

Applying the second law of reflection,

Second Law of reflection: The law of refelection states that the incident angle, reflected angle.

Mathematically, it can be expressed as

i = r...................... Equation 1

From the question, we were told that the light strik the plane at an angle of 20 degrees to the normal.

Therefore,

i = 20 degrees.

If i = 20 degrees,

then,

r = 20 degrees.