Question

3.
The refractive index of ruby is 1.71 and speed
of light in air is 3 × 108 m/s. Find speed of
light in ruby.
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Answer 1

Answer:

n = c/v

v = 3×10⁸/1.71

v = 1.754×10⁸ ms-¹

Answer 2

Answer:

n=speed in air /speed in ruby = 3×10⁸/1.71

= 1.754×10⁸ms-¹