Science
The refractive indices of three media are given below:
| Medium | Refractive Index |
|---|---|
| A | 1.6 |
| B | 1.8 |
| C | 1.5 |
A ray of light is travelling from A to B and another ray is travelling from B to C.
(a) In which of the two cases the refracted ray bends towards the normal?
(b) In which case does the speed of light increase in the second medium? Give reasons for your answer.
Refraction Plane Surfaces
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Answer
(a) The light ray travelling from A to B will bend towards the normal because when a ray of light travels from optically rarer medium to an optically denser medium it moves towards the normal and in this case as nB > nA so, A is a rarer medium and B is a denser medium.
(b) Speed of light increases in the second medium when light travels from B to C. Since speed of light is inversely proportional to refractive index and nB > nC so its speed increases when travelling from B to C.
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