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KEAM Refraction — practice questions

Explore 3 free Refraction questions in KEAM Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Refraction questions and exercises with answers

Showing questions 1–3 of 3.

When light passes from one medium to another, which property remains **unchanged**?Read the answer and worked solution →The **wavelength** of light of wavelength 600 nm in air becomes (in water, n = 1.33) approximately:Read the answer and worked solution →White light (400–700 nm) passes through a glass of refractive index 1.55. The wavelength range observed in the glass becomes approximately:Read the answer and worked solution →

Worked practice questions

When light passes from one medium to another, which property remains **unchanged**?

  1. Wavelength
  2. Speed
  3. Frequency
  4. Amplitude
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Correct answer: C. Frequency

**Frequency** is set by the source and doesn't change at a boundary (otherwise oscillating dipoles at the interface would be discontinuous). Wavelength and speed both change in proportion: $\lambda_2 = \lambda_1 \, n_1/n_2$, $v = c/n$.

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The **wavelength** of light of wavelength 600 nm in air becomes (in water, n = 1.33) approximately:

  1. ~451 nm
  2. ~600 nm
  3. ~798 nm
  4. ~452 μm
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Correct answer: A. ~451 nm

$\lambda_{med} = \lambda_0/n = 600/1.33 \approx 451$ nm. Wavelength shortens in a denser medium; frequency stays the same.

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White light (400–700 nm) passes through a glass of refractive index 1.55. The wavelength range observed in the glass becomes approximately:

  1. 400–700 nm
  2. 258–451 nm
  3. 620–1085 nm
  4. Cannot be determined
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Correct answer: B. 258–451 nm

$\lambda_{glass} = \lambda_0/n$. So 400/1.55 ≈ 258 nm and 700/1.55 ≈ 451 nm. Wavelengths shorten in proportion.

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