Question 29
Dispersion of Light and ColoursIn the diagram above, a beam of white light travels from a rare to a dense medium. What colours of light do the rays a, b, and c respectively represent?
- A.Blue, yellow and red
- B.Green, red and blue
- C.Red, green and blue
- D.Yellow, blue and red.
Show the answer and explanation
Answer: A (Blue, yellow and red)
Explanation
Blue light slows down most in the denser medium, so it bends most towards the normal (ray a); red bends least (ray c). Yellow lies between them.