The Human Eye and the Colourful World – Unit Test Paper
Q1: A person cannot see distinctly objects kept beyond 2 m. This defect can be corrected by using a lens of power which type?
Q2: Give reasons for the following:
i. Stars twinkle at night.
ii. The sun appears reddish early in morning.
iii. Planets do not twinkle.
iv. Red colour is used in danger signals.
Q3: A person walking in desert gets a illusion of seeing water. Name the phenomenon of light responsible for it.
Q4: Distinguish between Refraction and Dispersion.