WAEC Physics 2017 Objective — Question 29
Question 29 of 50 from the West African Examinations Council (WAEC) Physics 2017 Objective paper, with the correct answer and a full explanation.
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A ray of light travels from air to water. The refractive index of water is given by the expression
- A. A. velocity in water/velocity in air
- B. B. sin of angle of refraction/sine of angle of incidence
- C. C. apparent depth/real depth
- D. D. wavelength in air/wavelength in waterCorrect
Explanation
For a ray of light travelling from air to water, na/nw = sini/sinr = velocity in air/velocity in water = real depth/apparent depth = wavelength in air/wavelength in water.
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