Class 12 Physics Nature and propagation of light Notes and Important Questions
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Notes for Class 12 Nature and propagation of light (Physics) are shown above.
Practice
Important Questions
The given figure represents a wavefront AB moving in air and incident on a plane glass surface XY. Its position after refraction through the glass slab is CD. The refractive index of glass with respect to air will be equal to:
AB/CD
BD/AD
AC/AD
BD/AC
Which one of the following phenomena is not explained by Huygen's construction of wave front?
Refraction
Reflection
Polarization
Diffraction
The given figure represents a wavefront AB moving in air and incident on a plane glass surface XY. Its position after refraction through the glass slab is CD. The refractive index of glass with respect to air will be equal to:
AB/CD
BD/AD
AC/AD
BD/AC
Time taken by light to cross a glass slab of thickness 5 cm and refractive index of 1.5 will be:
0.2 ns
0.25 ns
0.3 ns
0.35 ns
How can a spherical wave front be changed into plane wavefront? Draw a diagram to justify your answer.
Apply Huygen’s principle to verify the law of reflection of light.
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Exam
Past Question Analysis
Historical exam-pattern data from past NEB question papers — not a prediction of future questions.
4
Question Items
3
Total Marks
4
Papers Appeared In
| Year | Question Items | Marks |
|---|---|---|
| 2083 | 1 | 1 |
| 2082 | 1 | 1 |
| 2081 | 1 | — |
| 2080 | 1 | 1 |
Also appears in 1 model question (not counted above — model sets aren't actual NEB exam history).
The wave nature of light is explored through Huygen's principle and the concept of wavefronts. Students study how light propagates and understand reflection and refraction from a wave perspective.
This page covers Nature and propagation of light, chapter 11 of 25 in the Class 12 Physics syllabus set by the National Examination Board (NEB). 5 important questions for this chapter are available, each with a full solution.
For numerical and derivation-based chapters like this one, working through past NEB questions is usually more useful than re-reading notes alone — try solving each important question above before checking the solution, then compare your working step by step.