Question

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 certain direction, but the reflected light fro the wall can be seen anywhere, give reason.

Answer 1

The plane mirror has a smooth, plane reflecting shiny surface, so regular reflection takes place and reflected light goes in a fixed direction. Therefore, the reflected light can be seen only in a certain direction. On the other hand, the wall is a rough surface so irregular reflection takes place, and reflected light gets diffused in all directions. Therefore, the reflected light from the wall can be seen in any direction. As a result, 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 certain direction, but the reflected light fro the wall can be seen anywhere.

Answer 2

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We all know that light travels in a straight line and mirror reflected the light back.so when light falls on a mirror they reflect back in a straight line.and when light falls on a wall and they have no place to get reflected back so the light looks in a bigger manner.