| (i) A parallel beam of light approaches a plane surface separating two media. If medium 'one' is optically denser and medium 'two' is optically rarer, using Huygen's principle, explain and show how a refracted wavefront is constructed? |
| (ii) When a light wave travels from a rarer to a denser medium, the speed decreases. Does it imply reduction in its energy? Explain. |
Answer:
(i) 
(ii) Reduction in speed does not imply reduction in energy. This is because energy of light is dependent on its frequency and not velocity. \[E=hv\] [Particle theory of light]
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