Question

What is the angle of incidence if the reflected ray is at an angle of 80 degrees to the incident ray?
a. 80 degrees.
b. 40 degrees.
c. 90 degrees.

Answer 1

Answer:

40 degree

Explanation:

Suppose the incident ray is ‘i’ and the reflected ray is ‘r’ then a/c to the question

i + r = 80

Now, according to the law of reflection , the angle of reflection is equal to the angle of incidence .

i.e. i =r

Then ,

i + i = 80

=> 2 i = 80

=> i = 80/2

=> i = 40

Therefore, the angle of incident is 40 degree.