[" A double convex lens of focal length ...

[" A double convex lens of focal length "30cm" is "],[" made of glass.When it is immersed in a liquid "],[" of refractive inder "1.4," the focal length is found "],[" to be "126cm" .The critical angle between glass "],[" and the liquid is "]

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A double convex lens of focal length 30 cm is made of glass. When it is immersed in a liquid of refractive index 1.4, the focal length is found to be 126 cm. The critical angle between glass and the liquid is

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[" A double convex lens of focal length "30cm" is "],[" made of glass.When it is immersed in a liquid "],[" of refractive inder "1.4," the focal length is found "],[" to be "126cm" .The critical angle between glass "],[" and the liquid is "]

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