There must be a source of light. There must be an opaque body to obstruct the path of light. There must be an opaque screen to form the shadow. There must be a transparent body to obstruct the path of light.
Shadow: When light falls on an opaque object, light is obstructed and a dark patch on a screen kept behind is called a shadow. This is because light propagates in a straight line. If the distance between an object and screen is less, the shadow will be (umbra) dark and smaller. If the distance is increased shadow will be dim and larger.
Conditions Required for a shadow to form are:
1. There should be a source of light.
2. An opaque object.
3. A screen.
4. The opaque object is placed between the source of light and the screen.
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Answer:
There must be a source of light. There must be an opaque body to obstruct the path of light. There must be an opaque screen to form the shadow. There must be a transparent body to obstruct the path of light.
Explanation:
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Shadow: When light falls on an opaque object, light is obstructed and a dark patch on a screen kept behind is called a shadow. This is because light propagates in a straight line. If the distance between an object and screen is less, the shadow will be (umbra) dark and smaller. If the distance is increased shadow will be dim and larger.
Conditions Required for a shadow to form are:
1. There should be a source of light.
2. An opaque object.
3. A screen.
4. The opaque object is placed between the source of light and the screen.