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Question

Write the mathematical equation describing Snell's law.


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Solution

Step 1:

  • Snell's law states that for light rays traveling through a pair of the medium in contact, the ratio of sine angle of the incident to sine angle of refraction is constant.
  • Therefore, sinisinr=Constant
  • The constant in the above equation refers to the refractive index of the second medium relative to the first medium. We can write it as n21.

Step 2:

Hence, the mathematical equation of this law (Snell's Law) can be written as,

sinisinr=n21sinisinr=n2n1


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