Which of the following properties of light conclusively support the wave theory of light?
(a) Light obeys the laws of reflection.
(b) Speed of light in water is smaller than its speed in vacuum.
(c) Light shows interference.
(d) Light shows photoelectric effect.
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(b) speed of light in water is smaller than its speed in vacuum.
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b) Speed of light in water is smaller than the speed in vacuum. (c) Light shows interference. EXPLANATION: The reflection can happen in both waves and particles. The photoelectric effect shows the particle nature of light. Hence (a) and (d) are not true. The smaller speed of light in water than the speed in the vacuum cannot be explained by the particle nature of light. But it can be explained by the wave theory of light. Hence the option (b) is true. The phenomenon of interference can occur only in waves. (c) is true.
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