ICSE Class 10 Physics 2015 Solved Paper

Question : 19

Total: 74

The speed of light in glass is 2×105‌km∕ s.
What is the refractive index of glass?

Solution:

Refractive index of glass ‌=‌

‌ Speed of light in vacuum ‌

‌ Speed of light in glass ‌

‌=‌

3×108m∕ sec

2×105‌km∕ sec

‌=‌

3×108m∕ sec

2×108m∕ sec

‌=1.5‌‌

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