JEE Main 2018 — Ray Optics Question with Solution
JEE Main 2018 (15 Apr Shift 1 Online)
Question
A planoconvex lens becomes an optical system of focal length when its plane surface is silvered and illuminated from left to right as shown in Fig-A. If the same lens is instead silvered on the curved surface and illuminated from other side as in Fig. B, it acts like an optical system of focal length . The refractive index of the material of lens is
Choose an option
Show full solutionCorrect option: B
Correct answer
B1.55
Step-by-step explanation
Case-1
Power, Case-2
or, or, or,
Power, Case-2
or, or, or,
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This is a previous-year question from JEE Main 2018, 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.