A plane mirror is placed horizontally inside water (`mu`=4/3). A ray falls normally on it. Then mirror is rotated through an angle `theta`. The minimum value of `theta` for which ray does not come out of the water surface is

When mirror is rotated through an angle theta , a reflected ray from it moves through an angle of

When mirror is rotated through an angle theta , a reflected ray from it moves through an angle of

When a plane mirror is rotated through an angle theta then the reflected ray turns through the angle 2 theta then the size of the image

When a plane mirror is rotated through an angle theta then the reflected ray turns through the angle 2 theta then the size of the image

When a plane mirror is rotated through an angle theta , then the reflected ray turns through the angle 2theta , then the size of the image.

A ray of light falls normally on a plane mirror. What is the angle of incidence ?

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