Physics · Ray Optics and Wave Optics
An electromagnetic wave, whose wave normal makes an angle of 45° with the vertical, is travelling in air and strikes a horizontal liquid surface. While travelling through the liquid, it gets deviated through 15°. What is the speed of the electromagnetic wave in the liquid, if its speed in air is 3 × 10 8 m/s? (Take sin(30°) = 0.5 and sin(45°) = 1/√2)
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 12.5 × 10 8 m/s
- 22.1 × 10 8 m/s✓
- 31.5 × 10 8 m/s
- 4√2 3 × 10 8 m/s
Correct answer
2.1 × 10 8 m/s
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