JEE Main 2013 — Ray Optics Question with Solution
JEE Main 2013 (22 Apr Online)
Question
The image of an illuminated square is obtained on a screen with the help of a converging lens. The distance of the square from the lens is 40 . The area of the image is 9 times that of the square. The focal length of the lens is :
Choose an option
Show full solutionCorrect option: D
Correct answer
D
Step-by-step explanation
If side of object square and side of image square
From question,
or
i.e., magnification
From formula,
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This is a previous-year question from JEE Main 2013, 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.