तरंग प्रकाशिकी — बार-बार पूछे जाने वाले प्रश्न
Last updated: 5 July 2026
Every RBSE Class 12 Physics board paper from 2013 to 2026 for Wave Optics, sorted and tagged so you know exactly which Young's-double-slit, diffraction and Huygens'-principle questions to revise first.
Real previous-year questions with the exact RBSE board years they appeared in. 5 more high-yield questions — including polarisation and coherent-source questions — are in the free PDF.
To produce an interference fringe pattern, draw the necessary diagram of Young's double slit experiment. Derive an expression for the fringe width of bright fringes.
व्यतिकरण फ्रिंज प्रतिरूप उत्पन्न करने के लिए यंग द्वि-स्लिट प्रयोग का आवश्यक चित्र बनाइये। प्रदीप्त फ्रिंजो के लिये फ्रिंज चौड़ाई का व्यंजक व्युत्पन्न कीजिए।
🔥 Most repeated · asked 4×Define diffraction of light.
प्रकाश का विवर्तन की परिभाषा लिखिए।
🔁 Repeated · asked 3×What is a wavefront? Explain the laws of refraction of light on the basis of Huygens' wave theory.
तरंगाग्र किसे कहते है? हाइगेंस के तरंग सिद्धान्त के आधार पर प्रकाश के अपवर्तन नियमों की व्याख्या कीजिए।
🔁 Repeated · asked 2×What are coherent sources?
कला संबद्ध स्रोत किसे कहते हैं?
⚙️ Core conceptWrite any two necessary conditions for interference of light. Obtain the formula for fringe width in Young's double slit experiment.
प्रकाश के व्यतिकरण के लिए कोई दो आवश्यक शर्तें लिखिए। यंग द्रिस्लिट प्रयोग में व्यतिकरण फ्रिंजों की चौड़ाई ज्ञात करने का सूत्र प्राप्त कीजिए। आवश्यक चित्र बनाइए।
⭐ High-weightage derivationThe other 5 are in the free PDF — and all 33 previous-year questions for this chapter are in the full book.
Get 10 hand-picked previous-year questions from Chapter 10. Every question includes the exam year, marks, and repeat count. Instant download—no signup required.
A quick map of the chapter before you download — so you know what the questions are testing.
If you have gone through the last decade of RBSE Class 12 Physics papers, you will notice Chapter 10 (Wave Optics) is tested every year without fail. It belongs to Unit VI — Optics and is drawn from a pool of 33 previous-year questions spanning 2013–2026, spread across MCQs, very short, short and long-answer sections. The topics rotate, but the question patterns stay remarkably steady.
Expect 1-mark openers defining diffraction, coherent sources, or wavefront. The 1.5 to 2-mark questions lean on Huygens' explanation of refraction. The heavy marks sit in the 2 to 4-mark questions, which almost always ask you to draw Young's double-slit experiment and derive the fringe-width expression — RBSE's most repeated question from this chapter.
So the smart way to revise this chapter is not to read it end to end, but to practise the questions RBSE actually repeats. The five questions above — and the ten in the free sample PDF — are taken straight from real board papers and tagged with the exact years they appeared, so you can see for yourself what the full RBSE Physics chapterwise PYQ book offers before you decide to buy it.
The RBSE syllabus sub-topics this chapter's PYQs are drawn from — useful for scoping your revision even if you're not buying the full book.
"Young's double slit wala fringe-width derivation almost har saal aata hai, list se pata chala."
"Free PDF mein diffraction aur Huygens principle wale short questions bahut kaam aaye."
"Year-wise tags dekh kar revision plan banana easy ho gaya. Poora 14-chapter book bhi le liya sirf ₹59 mein, paisa vasool."
The ₹59 full book unlocks all 33 tagged previous-year questions for Wave Optics — plus all 13 other chapters.
Every MCQ, VSA, SA and long-answer question for this chapter from RBSE papers 2013–2026 — 33 in total.
Each question labelled with year, marks and question type.
Highest-repeated questions listed first so revision time is spent well.
Full bilingual coverage — study in whichever medium you write your exam.
Quick-reference sheet of every wave optics formula — fringe-width, Huygens' principle and diffraction-pattern formulas.
Updated to the latest RBSE board pattern, with access valid for the current 2026–27 exam session.
One booklet, every chapter, tagged and sorted by repeat priority — in English and Hindi.
See full book — ₹59 →