A tall man, of height $6$ feet, wants to see his full image. The required minimum length of the mirror will be:

The correct mirror image of the figure is:
       

1.		2.
3.		4.

Two plane mirrors, $A$ and $B$ are aligned parallel to each other, as shown in the figure. A light ray is incident at an angle of $30^\circ$ at a point just inside one end of $A.$ The plane of incidence coincides with the plane of the figure. The maximum number of times the ray undergoes reflections (excluding the first one) before it emerges out is:
   
1. $28$                     
2. $30$
3. $32$         
4. $34$

Light of wavelength $5000~\mathring{A}$ falls on a plane reflecting surface. For what angle of incidence is the reflected ray normal to the incident ray?
1. $37^{\circ}$
2. $45^{\circ}$
3. $90^{\circ}$
4. $0^{\circ}$

A point source of light $B$ is placed at a distance $L$ in front of the centre of a mirror of width $d$ hung vertically on a wall. A man $(A)$ walks in front of the mirror along a line parallel to the mirror at a distance $2L$ from it as shown. The greatest distance over which he can see the image of the light source in the mirror is:
                         
1. $\frac{d}{2}$
2. $d$
3. $2d$
4. $3d$

An object is placed $20~\text{cm}$ in front of a concave mirror of a radius of curvature $10~\text{cm}.$ The position of the image from the pole of the mirror is:
1. $7.67~\text{cm}$
2. $6.67~\text{cm}$
3. $8.67~\text{cm}$
4. $9.67~\text{cm}$