To obtain the powerful parallel beams of light from a
vehicle's headlighl, one must use

To produce a parallel beam of light from a point source one should use a

In a dark room, a parallel beam of light falls on a plane mirror and another parallel beam of light falls on a white wall. The light reflected by the mirror can be seen only in a certain direction, but the reflected light from the wall can be seen from anywhere. Give reason.

Which mirror should be used to obtain a parallel beam of light from a small lamp, placed in front of the mirror ?

Explain how a parallel beam of light on refraction from a convex lens gets converged.

Which of the following can make a parallel beam of light from a point source is incident on it ?

Which of the following can make a parallel beam of light from a point source is incident on it ?