: An optical fiher uses flint glassurounded by a crown glass : An optical fiber

Question

: An optical fiher uses flint glassurounded by a crown glass : An optical fiber uses flint glass surrounded by a crown glass Mediumm n Medium n ISolids at 20 1000293 Diamond 2.419 1.434 Air Carbon dioxide 1.00045 Fluorite Hydrogen Oxygen 1.000139 Glass, crown 1.52 1.000271 Glass, flint 1.66 1.309 Ice at 0 Liquids at 20°C Benzene 1.49 501 Polystyrene Carbon disulfide 1628 Sodium chloride 1.544 Carbon tetrachloride 1461 Quartz, crystalline| 1544 Ethanol Water, fresh Glycerine 1.361 Quartz, fused 1.458 1.333 Zircon 1.473 3 1.923

Explanation / Answer

Sol:

Using snell's law

n1*sin(theta_1) = n2*sin(theta_2)

For critical angle theta_2 = 90 degrees

sin(theta_1) = 1.52/1.66 = 0.915

theta_1 = sin^(-1)(0.915) = 66.2 degrees

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