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JEE Advanced 2018 Paper 1

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Question : 13

Total: 54

Sunlight of intensity 1.3kWm−2 is incident normally on a thin convex lens of focal length 20cm. Ignore the energy loss of light due to the lens and assume that the lens aperture size is much smaller than its focal length. The average intensity of light, in kWm−2,at a distance 22cm from the lens on the other side is

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