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A ray of light is incident on a glass surface at an angle of 50° with the corresponding angle of refraction 30°. Find the value of the R.I. of glass.

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R.I. = sin i/sin r

aμg = sin i/sin r = sin 500/sin 300 (∠i = 500  and ∠r = 300)

= 0.7660/0.5000

aμg = 0.1532.

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