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प्रश्न
The speed of light in substance X is 1.25 × 108 m/s and that in air is 3 × 108 m/s. The refractive index of this substance will be:
(a) 2.4
(b) 0.4
(c) 4.2
(d) 3.75
उत्तर
2.4
Refractive index = `"speed of light in air"/"speed of light in the substance"`
`(3xx10^8 "m/s ")/(1.25xx10^8"m/s")`=2.4
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