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JEE Main 2013 Physics question

PhysicsRay Optics and Optical InstrumentsJEE Main 2013

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 :

Answer: (4)

Solution

Area ratio 9 ⇒ linear magnification 3 (real, inverted), so v = 120 cm. $Missing argument for \frac\frac1f

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Question ID VK-104009