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Question

A beam of light has frequency of 5×1014Hz. How many wavelengths of this light wave are there in 0.1 mm thick glass tape (nglass=1.5)?
  1. 100
  2. 150
  3. 250
  4. 300


Solution

The correct option is C 250

t=nλ
n=tλ=tvfrequency
=(t)(frequency)(CRI)
=(t)(freq)(R.I.)C
=104×5×1014×1.53×108
=5×1.53×102
=5×1503=250

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