A plane surface separates a denser medium of refractive index `1.5` from air. A plane wavefront travelling in air is incident on the interface at an angle of `30^(@)`. What will be the angle of refraction ?
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Here, `I = 30^(@), r = ? Mu = 1.5` According to Snell's Law `(sin i)/(sin r) = mu` `sin r = (sin i)/(mu) = (sin 30^(@))/(3//2) = (1//2)/(3//2) = (1)/(3) = 0.3333` `r = sin^(-1) (0.3333) = 19.5^(@)`
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