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Which one of the… (Class 12 Physics SQP 2026-27, Q5)

questionbuddy.in/q/cbse-12-physics-2026-27-sqp-q5-phenomenon-not-explained-huygens-construction

PhysicsCBSE Class 12 · Sample paper, session 2026-27 · 1 mark · MCQ

CBSE Class 12 Physics sample paper 2026-27: question 5

From the official CBSE sample question paper for 2026-27, section A, question 5, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q5 · 1 mark · MCQWave Optics

Which one of the following phenomenon is not explained by Huygens’ construction of wave front?

  1. (A)Diffraction
  2. (B)Refraction
  3. (C)Reflection
  4. (D)Origin of spectra

Source: official sample paper from cbseacademic.nic.in (PDF). See it in the full Sample paper 2026-27.

Hints

Open one hint at a time and try again before the next.

Hint 1

Huygens' principle deals with how waves propagate.

Hint 2

Which option is about emission of light by atoms rather than its propagation?

Step-by-step solution

Each step shows the marks it earns, as an examiner would award them. Checked by an independent re-solve from the question paper.

  1. Huygens' construction explains reflection, refraction and diffraction, because these are wave propagation effects.

    ½ mark

  2. The origin of spectra comes from quantised atomic energy levels, which a wavefront construction cannot explain. Option (D).

    ½ mark

Answer: Origin of spectra, option (D)

Where the marks are

  • Identifies origin of spectra as not explained by Huygens' construction (1 mark)

Revise the chapter

Practise this chapterBoard-style questions from Wave Optics, one at a time, marked against the answer key and marking points.Back to the full paperSample paper 2026-27: every question, by section.

The question is transcribed from the official paper; figures are described in words. The solution, hints and chapter tag are ours. Spotted an error? Write tosupport@questionbuddy.in.