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Which of the following is not always necessary to observe a shadow? (a) Sun (b) Screen (c) Source of light (d) Opaque object |
| Answer» N:-Which of the following is not always necessary to OBSERVE a shadow? (a) Sun (b) SCREEN (C) Source of light (d) Opaque objectAnswer:-(a) Sun is not always necessary to observe a shadow because any source of light, an opaque object and a screen are just necessary enough to see a shadow. | |