Which of the following is/are not always necessary to observe a shadow?


Any source of light, opaque object and screen are necessary to form a shadow.

● Option (a) : the sun is not necessary to form a shadow because we can form shadow from some other sources of light also like torch etc. Hence the answer is option (a).


● Option (b) : screen is necessary to take the image.


● Option (c) : any source of light is necessary to form the shadow like torch, bulb, streetlight etc.


● Option (d) : the opaque object is necessary to block the light.

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