Question

A double convex lens of focal length 30 cm is made of glass.when it is immersed in a liquid of refractve index 1.4 the focal length is found to be 126 cm the crticial angle between glass and the liquid is

Answer 1

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✯♦critical angle :-- It is that angle of imcidence in the denser medium for which the angel of refraction in the rarer medium is 90° .


▶Critical angle is not dependent on the focal length it just depends on the angle of incidence and refractive index.

♦μ= 1 / sinC

》sinC= 1 / μ  = 1 / 1.4

》sinC=0.71

》C = 45.23°
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Answer 2

✯♦critical angle :-- It is that angle of imcidence in the denser medium for which the angel of refraction in the rarer medium is 90° .

▶Critical angle is not dependent on the focal length it just depends on the angle of incidence and refractive index.

♦μ= 1 / sinC

》sinC= 1 / μ = 1 / 1.4

》sinC=0.71

》C = 45.23°