Question

What are the requirements for a formation of a shadow?
Guys pls give a long answer​

Answer 1

$\colorbox{pink}{Requirements for formation of a shadow :-}$

➪ There should be an opaque material.

➪ There should be a source of light and screen.

➪ The object must be placed in the path of light.

➪ Then shadow is formed on the screen.

Answer 2

Explanation:

An opaque object blocks the light falling on it. This creates an area of darkness on the side of the object away from the source of light. A translucent object also creates a faint area of darkness. An area of darkness formed by an opaque object obstructing light is called a shadow. The following three things are required for a shadow to form:

a source of light

an opaque object

a screen or surface behind the object.

A shadow will not form if any of these is absent. This explains why we cannot see a shadow in the dark. It is only when light rays are obstructed by an opaque object that we get a shadow of the object.

Let us perform an activity to learn about the characteristics of a shadow.

Materials needed: A torch, a few small opaque objects of different shapes and sizes and a white screen (a piece of cardboard covered with white paper).

Method:

Turn on the torch and place the object (whose shadow you want to study) in front of it.

Hold the screen on the other side of the object to get the shadow.

Ask your friend to trace out the outline of the shadow on the screen.

Now, keeping the positions of the torch and the screen to the torch. What do you see?

Note the colour and the size of the shadow.

Repeat steps 1 to 5 for different objects.