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