Question

a plane mirror is inclined at an angle theta with horizontal as shown in figure if Ray incident from 10 degree above horizontal becomes vertical after reflection from a mirror then find theta

a plane mirror is inclined at an angle theta with horizontal as shown in figure if Ray incident from 10 degree above horizontal becomes vertical after reflection from a mirror then find theta • Physics Class .•onta/ as shown in figure. es vertical after reflection 100 100 .900-0 .

Answer 1

Answer:

40

Explanation:

Angle between the reflected and incident ray = 80 (Final ray is vertical and incidence is 10 wrt horizontal)

Angle of incidence = angle of reflected ray = 40

Angle of reflected ray with mirror = 90 – 40 = 50

So, angle with horizontal = 90 – 50 = 40

Answer 2

Answer:

50°

Explanation:

i = r

r = 100 - theta

y + r = 90

y = 90 - 100 + theta

y + 10 = theta

y = theta - 10

y + theta + 90 = 180

theta - 10 + theta + 90 + 180

2 theta = 100

theta = 50