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A lens of diameter 5cm and focal length 25cm was cut along diameter into two halves. In the process the layer of lens a=1mm in thickness was lost. Then the halves were
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The diameter of an aperture of a Plano-convex lens is 6cm and maximum thickness is 3mm. If the velocity in material is $2 \\times {10^8}$ m\/s, calculate focal length of the lens:$\\left(
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Diameter of a plano - convex lens is 6cm and thickness at the centre is 3 mm. If speed of light in material of lens is 2 × 10^8 m/s , the
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