Physics
When light enters from air to glass, it bends toward the normal. If red, blue, and yellow colours are allowed to enter the same glass block at the same angle of incidence, then for which colour, the value of ∠𝑖 − ∠𝑟, be greater?
- green
- red
- blue
- yellow
Refraction Plane Surfaces
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Answer
Blue
Reason — Blue light has a shorter wavelength, so it slows down more in glass and bends more towards the normal than red or yellow light. This means that the angle of refraction (∠𝑟) for blue light becomes smaller compared to red or yellow light. So the difference ∠𝑖 − ∠𝑟 becomes greatest for blue light.
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