Question

if the angle of incident ray is 30 less than by the angle which is denoted by the ray from the plane surface then what is the value of angle of incidence and angle of reflection​

Answer 1

Since , the angle of incidence is 30 less then the angle between incident ray and reflecting surface .

Now, angle between the incident ray and reflecting surface is known as glancing angle of incidence .

Let <i = x .

→glancing angle of incidence = 90-x .

Thus , according to question

x =( 90-x)-30

→x = 90-x-30

→x =60-x .

→2x = 60

→x = 30.

Thus , angle of incidence =30