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Tw9 planoconcave lenses of glass of refractive index 1.5 have radii of curvature of 20cm and 30cm.They are placed in contact with curved surfaces towards each other and space between them is
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A cylinder of capacity 20 litres is filled with H2 gas. The total average kinetic energy of translatory motion of its molecules is 1.5×105J. Find the pressure of hydrogen in the cylinder.