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JEE Main Physics Class 12 Ray Optics and Optical Instruments Part 1 Questions

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Question : 70

Total: 99

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 cm. The area of the image is 9 times that of the square. The focal length of the lens is :

[Online April 22, 2013]

36 cm
27 cm
60 cm
30 cm

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