NDA 2018 Physics question
Consider the following statements about a microscope and a telescope : 1. Both the eyepiece and the objective of a microscope are convex lenses. 2. The focal length of the objective of a telescope is larger than the focal length of its eyepiece. 3. The magnification of a telescope increases with the increase in focal length of its objective. 4. The magnification of a microscope increases with the increase in focal length of its objective. Which of the statements given above are correct?
Solution
A compound microscope uses two convex lenses (1 correct). A telescope has an objective of large focal length and an eyepiece of small focal length, and its magnification is
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