Q113 / 160 · JIPMER 2011 · Physics

A light movs from denser to rarer medium, which of the following is correct?

  • A
    Energy increases
  • B
    Frequency increases
  • C
    Phase changes by $90^{\circ}$
  • Correct answer
    D
    Velocity increases

Solution

When a ray of light moves from one medium to other, its velocity changes. This change depends on refractive index of the medium. Light travels from denser to rarer medium, $i e$, from medium of higher refractive index to lower refractive index. So, in second (rarer) medium, its velocity increases.

Hence, the correct answer is option: 'D'.

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