Physics · Optics
The permittivity of water at optical frequencies is given as 1.75ε0. An isotropic light source placed at a depth 'd' under water forms a circular illuminated patch of radius 5 m on the surface due to total internal reflection. The value of depth 'd' is approximately:
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 15.73 m
- 24.33 m✓
- 33.33 m
- 42.33 m
Correct answer
4.33 m
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