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Geometrical Optics question

2018 · Shift 1 · Q47
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Geometrical Optics question

2018 · Shift 1 · Q47

JEE AdvancedPhysicsGeometrical OpticsNumerical+3 / −1
Sunlight of intensity 1.3kW m−21.3kW\,{m^{ - 2}}1.3kWm−2 is incident normally on a thin convex lens of focal length 202020 cm. 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 kW m−2,kW\,{m^{ - 2}},kWm−2, at a distance 222222 cm from the lens on the other side is ‾\underline{\hspace{2cm}}​.
Numerical answer
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