In the shown figure, mirror is rotated by an angle theta. Find theta if

ray of light retraces its path after reflection from M
ray of light MP turns in the direction of MN.

In terms of theta find the value of i, show that ray of light retraces its path after third reflection

In terms of theta find the value of i, show that ray of light retraces its path after third reflection

A ray of light after reflection from a mirror is known as

For the situations shown in figure, determine the angle by which the mirror should be rotated, so that the light ray will retrace its path after refraction through the prism and reflection from the mirror?

For the situations shown in figure, determine the angle by which the mirror should be rotated, so that the light ray will retrace its path after refraction through the prism and reflection from the mirror?

Show that for a given incident ray, if the mirror is rotated by an angle theta , the reflected ray rotates by 2theta .

A small angled prism of apex angle A=4^@ and refractive index mu=1.5 is placed in front of a vertical plane mirror as shown in figure. If the mirror is rotated through an angle theta, then the light ray becomes horizontal either after the mirror or after second time passing from the prism in opposite direction. The value theta is

A small angled prism of apex angle A=4^@ and refractive index mu=1.5 is placed in front of a vertical plane mirror as shown in figure. If the mirror is rotated through an angle theta, then the light ray becomes horizontal either after the mirror or after second time passing from the prism in opposite direction. The value theta is