Question

A student covered a torch with red cellophane sheet to obtain red light. Using the red light she obtains a shadow of an opaque object. She repeats this activity with green and blue light. Will the colour of the light affect the shadow? Explain.

Answer 1

No. The colour of the light will not affect the shadow, because shadow is a dark patch formed when an object obstructs the path of light, such that no light reaches in the shadow region. Hence the colour of shadow formed by red, blue and green light will be the same, which is black.