Single correct option
Which of the statements given below is/are correct?
1. The speed of light in a vacuum is the same for all colours.
2. The speed of light in glass is greater than its speed in air.
1. The speed of light in a vacuum is the same for all colours.
2. The speed of light in glass is greater than its speed in air.
- A. 1 only
- B. 2 only
- C. Both 1 and 2
- D. Neither 1 nor 2
Show answer and solution
Answer: (A) 1 only
All electromagnetic waves travel at the same speed c in a vacuum, whatever their wavelength; statement 1 is correct. Glass has a refractive index of about 1.5, so light is slower in it than in air; statement 2 is wrong.
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