Light of wavelength 600 nm travels through glass with refractive index 1.5. The speed of light in this glass is approximately (speed of light in vacuum = 3 × 10⁸ m/s):
Q1. Light of wavelength 600 nm travels through glass with refractive index 1.5. The speed of light in this glass is approximately (speed of light in vacuum = 3 × 10⁸ m/s):
Answer: 2.0 × 10⁸ m/s
Explanation: The speed of light in a medium equals c divided by the refractive index: v = (3 × 10⁸) / 1.5 = 2.0 × 10⁸ m/s. A higher refractive index means light travels more slowly through that medium compared to a vacuum.