Refraction and lensesPractice Questions & MCQs
Practice Refraction and lenses questions from Light - Reflection and Refraction (Class 10 Science) - important MCQs with answers and step-by-step solutions. Solve the sample questions below, then practice the full set free on the RankByte app.
Refraction and lensesQuiz - Solve & Score
Q1. When white light passes through a glass prism, which colour deviates the most?
- A.Violet
- B.Red
- C.Green
- D.Yellow
Answer: A. Violet
What this question tests: Refractive index of glass is highest for violet and lowest for red. By Snell's law, higher n gives greater deviation. So violet deviates most, red the least. Hence the order V-I-B-G-Y-O-R in a spectrum top to bottom for a prism with apex up. Thus the correct option is A) Violet.
Q2. Inside a jeweller's diamond, light is clocked at 1.24 x10^8 m/s; with the vacuum speed taken as 3 x10^8 m/s, what is the refractive index of the material?
- A.2.92
- B.1.76
- C.0.41
- D.2.42
Answer: D. 2.42
n = c/v = (3 x10^8)/(1.24 x10^8) = 2.42. Light slows in the medium so n > 1.
Q3. A laser pulse crawls through a clear ice sheet on a frozen lake at only 2.29 x10^8 m/s. Given c = 3 x10^8 m/s, what refractive index does this imply?
- A.1.81
- B.0.71
- C.1.31
- D.0.76
Answer: C. 1.31
n = c/v = (3 x10^8)/(2.29 x10^8) = 1.31. Light slows in the medium so n > 1.
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