Question

An object appears blue when seen in white light. What colour will it appear in red light?

Answer 1

1. The object will appear black.
2. To see any colour of any object, it is important that the object should reflect any one of the colours of white light. It is known that white light is made up of seven colours and they are violet, indigo, blue, green, yellow, orange and red.
3. An object appears blue in white light because it reflects only blue colour and absorbs the other colours of white light. Now when that object is kept in red light, there is no colour to be reflected, and the object absorbs all the red lights which are falling on it, hence, appearing black.