Reflection of Light

An observer moves towards a stationary plane mirror at a speed of 4 m/s the speed with which his image move towards him?

In the figure given below, PQRS denotes the path followed by a ray of light as it travels through three mediums in succession. The absolute refractive indices of the media are$\mu 1, \mu 2 and \mu 3$ respectively.$(The line segment RS1 in the figure is parallel to PQ).$ Then

The wavelength of light in two liquids X and Y is 365 nm and $7.3 \times {10}^{-7}$ m, then the critical angle of X relative to Y will be

A ray of light travels from A to B with uniform speed. On its way it is reflected by the surface. The path followed by ray to take least time is

A point source of light L is placed at a distance x in front of the centre of a mirror of width y hung vertically on a wall. A man walks in front of mirror along a line parallel to the mirror at a distance 3x from it as shown. The greatest distance cover which he can see the image of the light source in the mirror is

Two plane mirrors are aligned parallel to each other, as shown in the figure. A light ray is incident at an angle of 30° at a point just inside one end of a mirror. The maximum number of times the ray undergoes reflection. $\left(including the first one\right)$ before it emerges out is

Two plane mirrors are parallel to each other and placed 20 cm apart. An object is kept in between them at 15 cm from A. Out of the following at which point an image is not formed in mirror A $\left(dis\tan ce measure from mirror A\right)$

It is desired to photograph the image of an object placed at a distance of 4m from the plane mirror. The camera which is at a distance of 6m from the mirror should be focused for a distance of

Mark true or false

1. A ray of light when incident normally on a plane mirror then the angle of reflection will be 90°

2. A place mirror produced a magnification of -1

3. When a plane mirror is rotated through an angle 20°, then the reflected rays turns through the angle 20°

Two plane mirrors are at right angles to each other. A man stands between them and combs his hair with his right hand. In how many of the images will he seen using his right hand?

A small object is placed 30 cm in front of a plane mirror. If you stand behind the object 30cm from the object 30 cm from the object and look at its image, the distance focused for your eye will be at

 A man is 180cm tall and his eye are 10cm below the top of his head. In order to see his entire height right from toe to head, he uses a plane mirror kept at a distance of 1m from him  . The minimum  length of the plane mirror is required.

The light reflected by a plane mirror may form a real image

A man runs by towards a mirror at a speed 15 m/s.  The speed of image relative to the man is

Cotyledons are also called-