MCQ practice · SSC Physics Board questions · Chapter 9: Refraction of Light
On which of the following, when light falls on it, does the light turn into a spectrum?
Think it through first, then pick an option.
- a mirror
- b prism
- c rear view mirror
- d side view mirror
Answer and explanation
Correct answer: b prism
In a prism each colour has its own refractive index, so white light leaving it has its colours bent through different angles and forms a spectrum.
Why the other options are wrong
- a mirror: A mirror reflects light and does not separate its colours. The colours separate in a prism, where each colour has its own refractive index.
- c rear view mirror: A rear view mirror is a kind of mirror and reflects light. A spectrum is made by a prism, where the colours separate by refraction.
- d side view mirror: A side view mirror only reflects light. It is the prism that splits white light into colours.
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