Question

three plane mirrors are placed such that angle between the first and second or second and third is the same x .A light striking the first mirror after reflection at the three mirrors emerges opposite to the initial direction.Find the value of x ?​

Answer 1

Answer:

from that attachment angle between incident ready and mirror is (theta-90)

and Ray passing parallel to the second mirror

so angle between incident ready and reflected Ray should be 90 degree

so angle between incident angle and reflected angle is 45 degree

equate with 90-45=(theta-90)

so theta is 135

hope u understand