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Home › Physics › Optics - Refraction

Optics - Refraction — Physics Questions & Practice

Practise 7 Optics - Refraction questions from Physics for competitive exams such as UPSC, Banking, SSC and Railway. Read the worked questions below, check every answer with an explanation, and track what you get wrong.

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Practice questions on Optics - Refraction — with answers

Try each question first, then open the answer. Explanations are included.

1. A medium has a refractive index of 1.25. What is the speed of light in this medium? (n = c/v, c = 3 x 10^8 m/s)

  1. A2.4 x 10^8 m/s
  2. B1.92 x 10^8 m/s
  3. C2.88 x 10^8 m/s
  4. D3.36 x 10^8 m/s
Show answer

Answer: A

v = c/n = (3x10^8)/1.25 = 2.4 x 10^8 m/s.

2. A medium has a refractive index of 1.6. What is the speed of light in this medium? (n = c/v, c = 3 x 10^8 m/s)

  1. A1.875 x 10^8 m/s
  2. B1.5 x 10^8 m/s
  3. C2.625 x 10^8 m/s
  4. D2.25 x 10^8 m/s
Show answer

Answer: A

v = c/n = (3x10^8)/1.6 = 1.875 x 10^8 m/s.

3. A medium has a refractive index of 1.2. What is the speed of light in this medium? (n = c/v, c = 3 x 10^8 m/s)

  1. A2.5 x 10^8 m/s
  2. B1.5 x 10^8 m/s
  3. C2.0 x 10^8 m/s
  4. D3.5 x 10^8 m/s
Show answer

Answer: A

v = c/n = (3x10^8)/1.2 = 2.5 x 10^8 m/s.

4. A medium has a refractive index of 1.3. What is the speed of light in this medium? (n = c/v, c = 3 x 10^8 m/s)

  1. A2.3077 x 10^8 m/s
  2. B1.8462 x 10^8 m/s
  3. C2.7692 x 10^8 m/s
  4. D3.2308 x 10^8 m/s
Show answer

Answer: A

v = c/n = (3x10^8)/1.3 = 2.3077 x 10^8 m/s.

5. A medium has a refractive index of 1.33. What is the speed of light in this medium? (n = c/v, c = 3 x 10^8 m/s)

  1. A2.2556 x 10^8 m/s
  2. B1.8045 x 10^8 m/s
  3. C2.7067 x 10^8 m/s
  4. D3.1578 x 10^8 m/s
Show answer

Answer: A

v = c/n = (3x10^8)/1.33 = 2.2556 x 10^8 m/s.

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