JEE Main 2020PhysicsRay OpticsEasyMCQ

JEE Main 2020Ray Optics Question with Solution

JEE Main 2020 (08 Jan Shift 1)

Question

The magnifying power of a telescope with tube length 60cm is 5. What is the focal length of its eye piece?

Choose an option

Show full solutionCorrect option: D
Correct answer
D10cm

Step-by-step explanation

m=f0fe
5=f0fe
fo=5fe
fo+fe=60
6fe=60
fe=10

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About this question

This is a previous-year question from JEE Main 2020, covering the Ray Optics chapter of Physics. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.