Wave Optics: Class 12 Physics (CBSE) important questions and practice
Wave Optics is chapter 10 of 14 in CBSE Class 12 Physics. Below are the topics the paper draws from, the question types that come up again and again, and a free practice test on this chapter alone.
Topics in this chapter
- Huygens principle and verification of the laws of reflection and refraction
- Coherent sources and interference of light
- Young's double slit experiment: fringe width and intensity distribution
- Diffraction due to a single slit: positions of minima and secondary maxima
- Width of the central maximum (polarisation removed in CBSE but retained in some state boards)
What examiners usually ask
- Using Huygens principle prove Snell's law of refraction
- Derive the expression for the fringe width in Young's double slit experiment; what happens to the fringe width if the apparatus is immersed in water?
- In a single slit diffraction experiment the slit width is 0.2 mm and the screen is 1 m away; for light of 600 nm find the width of the central maximum
Exam tip
The fringe width derivation beta = lambda D/d and the single slit conditions (minima at a sin theta = n lambda, central maximum width 2 lambda D/a) are near-certain; also prepare the interference-versus-diffraction comparison table.
Wave Optics on other boards and exams
Frequently asked questions
What are the important questions from Wave Optics for CBSE Class 12?
The question types listed above repeat most often in CBSE Class 12 Physics papers for this chapter. Practise them with the chapter test and then attempt them inside a full previous-year paper under time.
Is Wave Optics in the CBSE Class 12 Physics syllabus?
Yes. Wave Optics is part of the current CBSE Class 12 Physics syllabus, as listed on this site from the prescribed textbook.
Can I practise Wave Optics MCQs in Hindi?
Yes. The chapter test and explanations are available in Hindi and English, with an AI doubt solver for any question.