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ICSE Class 10 Physics 2015 Paper

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Question : 19 of 74
Marks: +1, -0
The speed of light in glass is 2×105 km/s2 \times 10^5 \, \mathrm{km} / \mathrm{s}.
What is the refractive index of glass?
Solution:  
Refractive index of glass   =   Speed of light in vacuum  Speed of light in glass \;=\; \frac{\text{ Speed of light in vacuum }}{\text{ Speed of light in glass }}
  =  3×108 m/sec2×105 km/sec\;=\; \frac{3 \times 10^8 \, \mathrm{m} / \mathrm{sec}}{2 \times 10^5 \, \mathrm{km} / \mathrm{sec}}
  =  3×108 m/sec2×108 m/sec\;=\; \frac{3 \times 10^8 \, \mathrm{m} / \mathrm{sec}}{2 \times 10^8 \, \mathrm{m} / \mathrm{sec}}
  =1.5    \;=1.5 \;\;
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