Intext exercise Problem II — task. Science State Board, Class 9.

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The speed of light in air is

3 \times 10^{8} m / s

and in glass it is

2 \times 10^{8} m / s

. What is the refractive index of glass?

Answer:

The formula to find refractive index is

By applying the known values,

Refractive index $=$

Did you find an error?

2. Intext exercise Problem II