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2 In a setup of displacement method experiment distance between the screen and a light...

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Physics

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2 In a setup of displacement method experiment distance between the screen and a light source is 120 cm and the lens used has a small aperture By moving the lens between the source and the screen sharp images are obtained on the screen for two different positions of the lens The ratio of sizes of these two images is 1 9 a What is the focal length of the lens 22 5cm b Which image is the brighter one Determine the ratio of the brightness of these two images Smaller 9 times brighter

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