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Q. 15

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Physics for Scientists and Engineers: A Strategic Approach with Modern Physics
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Short Answer

A thin glass rod is submerged in oil. What is the critical angle for light traveling inside the rod?

The critical angle for light traveling inside the rod is

See the step by step solution

Step by Step Solution

Step 1 : Total Internal Reflection:

The boundary prevents the ray from refracting. Instead, all of the light reflects back into the prism from the boundary. This is known as total internal reflection, or TIR for short.

Step 2 : Critical Angle:

A critical angle is reached when. Because, Snell’s lawgives the critical angle of incidence as

Step 3 : Determine the critical angle for light inside the rod:

Equation that yields the critical angle for light travelling inside the rod is,

Substitute the Values:

Simplify:

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