Same chapter3 marksDifficulty: Medium
State two properties of ultraviolet radiation and one of its harmful effects.
Spectrum
3 marksDifficulty: Medium
What is meant by a pure spectrum, and how does it differ from an impure spectrum?
Original Khojo Papers practice question — not from a past board paper.
Answer
In a pure spectrum each colour occupies its own distinct position and the colours do not overlap. In an impure spectrum, such as the one from a single prism with a wide slit, neighbouring colours overlap so the boundaries are blurred.
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
A pure spectrum is obtained with a narrow slit and lenses that make the rays of each colour parallel before they reach the prism.
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