JEE Main 2013 Physics question
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.
Answer: (3)
Solution
Large telescopes are reflectors (Statement 1 true). A mirror can be supported over its entire back surface, whereas a large lens can be held only at its rim and sags under its own weight;
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