Science
Choose the correct option for the colour of rays for A and B.
| Colour of Ray A | Colour of Ray B | |
|---|---|---|
| A. | Blue | Red |
| B. | Green | Yellow |
| C. | Red | Violet |
| D. | Violet | Indigo |
options
- A
- B
- C
- D
Refraction Plane Surfaces
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Answer
C
Reason — In a glass prism, white light disperses into its colours since violet has the highest refractive index in glass so it deviates the most, while red has the lowest refractive index so it deviates the least toward the base of the prism.
In the diagram, ray B emerges closer to the base (more deviated), so it is violet and ray A is less deviated and therefore it is red.
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