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Ray Optics and Optical Instruments
Refraction
1 question from 1 paper, each with its answer.
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Concepts tested
- Frequency unchanged on refraction
All Questions
2001 AIPMT 1 question
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A ray of light travelling in air has wavelength λ, frequency n, velocity v and intensity I. If this ray enters into water then these parameters are λ', n', v' and I' respectively. Which relation is correctWhen light passes from one medium to another, its frequency remains unchanged, because the frequency is set by the source.
Speed decreases in water ($v' = \dfrac{v}{\mu}$), and so does the wavelength ($\lambda' = \dfrac{\lambda}{\mu}$).
Some light is reflected at the surface, so the intensity also decreases.
So the correct relation is n = n'.