Optical Instruments & the Eye
This question has Statement-1 and Statement-2. Of the four choices given after the Statements, choose the one that best describes the two Statements.
Statement 1: Very large size telescopes are reflecting telescopes instead of refracting telescopes. Statement 2: It is easier to provide mechanical support to large size mirrors than large size lenses.
Show answer and solution
Answer: (c)
- Statement 1 is true: the largest telescopes are reflectors.
- Statement 2 is true: a mirror can be supported over its whole back surface, while a large lens can only be held at its rim and sags under its own weight.
- This support problem is the reason very large telescopes use mirrors.
- So the answer is (c).