Question

A green leaf placed in a dark room is illuminated by red light. The leaf will appear to be

• A. green
• B. red
• C. yellow
• D. black

Answer 1

The correct option is D

black

1. The colour of an object depends upon the colour of the visible spectrum reflected by it.
2. Red light has the largest wavelength in the spectrum of colours.
3. In the problem, it is given that the leaf appears green ⇒
   1. Green is the only colour reflected by it.
   2. All other components of the visible spectrum are absorbed by it.
4. Given that, the darkroom is illuminated with a red colour.
5. Since the leaf absorbs the red colour, it will appear dark.

Therefore, the correct option is (D)