Question: Q. 2. When light travels from a rarer to a denser medium, it loses speed. Does this loss imply a reduction in energy carried by the light waves?
A [CBSE 2010]
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Solution:
Ans. No, this loss does not imply a reduction in energy carried by the light waves. Energy of any wave depends upon its frequency which remain same whenever light wave travels from one medium to another medium.
$$ 1+1=2 $$
AII Q. 3. Define type of light wave according to Huygens’ principle. Which optical phenomenon proves this wrong?
R [CBSE 2010]
Ans. According to Huygens’ principle, light is a longitudinal wave. Polarisation proves that light is not a longitudinal wave, it is a transverse wave.
$$ 1+1=2 $$
