Question

A sheet of plywood, a piece of muslin cloth, and a transparent glass, all of the same size and shape were placed at A one by one in the arrangement shown in Fig. Will the shadow be formed in each case? If yes, how will the shadow on the screen be different in each case?

\begin{tabular}{|l} \( S \) \\ \( C \) \\ \( R \) \\ \( E \) \\ \( A \) \\ \( N \) \end{tabular}

Answer 1

Step 1: Shadow

1. Shadow will produce when light rays are prevented to travel.
2. When an obstacle is placed in the direction of parallel light rays, then a shadow will form behind the obstacle.

Step 2: Shadow formation on the screen

A sheet of plywood-

A sheet of plywood is an opaque object, light rays can't pass through it. So, a complete shadow will produce behind the plywood (on the screen).

A piece of muslin cloth-

A piece of muslin cloth is translucent, a fraction of light rays will pass the cloth. So, a partial shadow will produce behind the muslin cloth.

Transparent glass-

The full amount of light will pass through a transparent glass. So, in this case, no shadow will produce on the screen.

Therefore, a piece of muslin cloth and a sheet of plywood will form shadows but a transparent glass slab won't.