Top 100 Physics General Knowledge Questions and Answers

1. Which mirror is to be used to obtain a parallel beam of light from a small
lamp ? – Concave mirror
2. The focal length of the lens in a photographic camera is 5 cm. What is the
power of the lens? – + 20 D
3. When viewed in white light, why do soap bubbles show colours? – Because of
interference
4. Angular separation between two colours of the spectrum depends upon which
thing? –