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. \(3d\)