Refractive index — task. Physics CBSE Live product, Class 10 (2026-27).

Select the best answer:

1. How do we define the refractive index of a given medium?

Ratio of angle of incidence to angle of refraction
Ratio of speed of light in medium to speed in vacuum
Ratio of wavelength to frequency
Ratio of speed of light in vacuum to speed in medium

2. When light enters a medium with higher refractive index, it

speeds up
slows down
stops completely
changes colour

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