$A$ man of height $h$ requires a mirror to see his own complete image. The minimum height of the mirror required is:

Two plane mirrors are at $45^{\circ}$ to each other. If an object is placed between them,then the number of images will be

$A$ ray of light is incident on a plane mirror at rest. The mirror starts turning at a uniform angular acceleration of $4\pi \, rad/s^2$. The reflected ray at the end of $\frac{1}{4} \, s$ must have turned through......$^o$

An object is initially at a distance of $100 \; cm$ from a plane mirror. If the mirror approaches the object at a speed of $10 \; cm/s$,then after $6 \; s$,the distance between the object and its image will be: (in $; cm$)

$A$ light ray is incident perpendicular to the plane of a mirror. The angle of reflection will be ......$^o$.

Light of wavelength $5000 \,\mathring{A}$ falls on a plane reflecting surface. What are the wavelength and frequency of the reflected light? For what angle of incidence is the reflected ray normal to the incident ray?