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A beam of width t is incident at 45 degrees on an air-water boundary. Find the width of the beam in water.

+7 votes
asked Sep 10, 2016 in Physics by Rahul Roy (7,955 points)

1 Answer

+7 votes
answered Sep 11, 2016 by Abhishek Kumar (14,688 points)
selected Jun 26, 2017 by sarthaks
Best answer

Hint: Apply Snell's Law and Refractive index formula to get the answer

Snell's Law describes the relationship between the angles of the two light waves and the indices of refraction of the two materials as:

n1 x sin(q1) = n2 x sin(q2)

Refractive Index (n) = D(measured)/D(apparent)

where D(measured) is the measured depth (from the surface of the liquid to the position of the mark on the empty cell) using the microscope, and D(apparent) is the mark measurement with and without liquid.

commented Sep 12, 2016 by Rahul Roy (7,955 points)
I did just like that but the answer didn't match
commented Sep 13, 2016 by Abhishek Kumar (14,688 points)
@Rahul, I have updated the answer.
commented Sep 16, 2016 by pratz (35 points)
Please can u explain it again step by step
commented Sep 16, 2017 by Ravi Patel (10 points)
Explain it in step by step

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