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Question
Write the approximate values of speed of light in (i) air and (ii) glass. Use these values to calculate the refractive index of glass with respect to air.
Solution
(i) Speed of light in air = 3 × 108 ms-1
(ii) Speed of light in glass = 2 × 108 ms-1
Refractive index of glass with respect to air
=
=
=
= 1.5
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