What are the conditions for the formation of shadow???


Conditions for the formations of shadows are 

1. A light source, an opaque obstacle, a screen.

2. Umbra, that is the dark part (shown in the above figure by the dark triangular shape) of the shadow must fall on the screen. 

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ANS:   The condition for the formation of a shadow is the presence of  an obstruction in the path of light, presence of a screen to obtain the shadow.

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