Question

Two parallel mirrors are placed according to figure. Angle made by Ray1 with mirror M1 after 3rd reflection is
a)30 b)90 c)120 d)60​

Answer 1

It will be (a.)60 degree because

ANGEL OF INCIDENT = ANGLE OF REFLECTION

SO,

angle which comes on M2 will be 60 as the reflection ray of miror 1 will be incident ray of mirror 2.

That is why angle will be 60 degree.

Mark it as a brainlest answer.