LU B.Sc Sem 1 Physics Optics Important Questions 2026 | PYQ Pattern
LU B.Sc 1st Semester Physics (Optics) Important Questions 2026 – Lucknow University (LU) aur affiliated colleges ke B.Sc NEP Semester I (PCM group) students ke liye Physics – Optics (Paper-II) ke sabse important questions, bilkul previous year question paper (PYQ) pattern me. Saare questions neeche page par hi hain – section-wise.
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Paper Details – B.Sc Sem 1 Physics (LU NEP 2026)
| University | University of Lucknow (LU) + affiliated colleges |
| Course | B.Sc. I Semester (NEP) – PCM |
| Paper | Physics – Optics (Paper-II) |
| Time / Marks | 2 Hours / 75 Marks |
| Pattern | Kul 4 questions: Section A se 1 (15 marks) + Section B se 3 (20 marks each) |
Section A – Important Questions (15 Marks)
Note: Section A se koi ek question attempt karna hai.
Q1. What are coherent sources and how are they produced in practice? Obtain the expression for fringe width in Young’s double slit experiment. The slits are 0.1 mm apart, the fringe width is 5 mm and the screen is 1 m away from the slits. Find the wavelength of the light. [15 Marks]
Q2. Explain the formation of Newton’s rings. Why is the central spot dark in reflected light? Obtain the expression for the diameter of the rings. In air, the diameter of the 10th dark ring for wavelength 6000 Å is 0.50 cm; find the radius of curvature of the lens. [15 Marks]
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Section B – Important Questions (20 Marks)
Note: Section B se koi teen questions attempt karne hain.
Q3. Define a zone plate and explain its construction and working. Why does it behave like a lens with multiple foci? Compare it with a convex lens. Find the radius of the first zone of a zone plate of focal length 0.2 m for light of wavelength 5000 Å. [20 Marks]
Q4. State Rayleigh’s criterion of resolution and obtain the expression for the resolving power of a plane diffraction grating. How many lines must a grating have to resolve the sodium D₁ and D₂ lines (λ₁ = 5890 Å, λ₂ = 5896 Å) in the second order? [20 Marks]
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Q5. What is specific rotation? Explain the construction and working of Laurent’s half-shade polarimeter. Find the specific rotation if a 20 cm length of 20% sugar solution rotates the plane of polarization by 26.4°. [20 Marks]
Q6. Explain the construction and working of the Fabry-Perot interferometer. Obtain the expression for the intensity of transmitted light and define the sharpness of fringes. In what ways is it better than Michelson’s interferometer? [20 Marks]
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Q7. (a) What is polarization of light? Give Brewster’s law, its applications and its limitations.
(b) Find the thickness of a quarter wave plate and a half wave plate, given μe = 1.553, μo = 1.544, λ = 5000 Å. [20 Marks]
Q8. (a) What are the Jones vector and the Jones matrix? Obtain the Jones matrices of quarter-wave and half-wave plates.
(b) Using the Jones matrices of right and left circularly polarized light, show that their superposition gives plane polarized light. [20 Marks]
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Q9. Discuss Fraunhofer diffraction at a double slit. Obtain the intensity expression, sketch the intensity distribution and find the missing orders when the slit separation equals the width of each slit. [20 Marks]
Q10. Write short notes on: (a) Double refraction; O-ray and E-ray (b) Michelson’s interferometer (c) Fresnel’s biprism (d) Interference vs diffraction [20 Marks]
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Exam Tips – Physics (Optics)
- Section A ke long answers ke short notes bana lo – 15 marks pakke karo.
- Section B ke derivations / numericals / diagrams ki practice karo.
- Upar ke questions ko 2 ghante me PYQ ki tarah solve karke dekho.
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FAQs
LU B.Sc 1st Semester Physics (Optics) exam me kitne questions attempt karne hote hain?
Ye 75 marks ka 2 ghante ka paper hai. Kul 4 questions attempt karne hote hain – Section A se 1 question (15 marks) aur Section B se 3 questions (20-20 marks).
Kya ye LU B.Sc Sem 1 Physics ka official previous year question paper (PYQ) hai?
Nahi. Ye LUUPDATE team ka banaya 2026 exam ke liye most important questions ka set hai, jo Lucknow University ke previous year papers ke pattern aur NEP syllabus par based hai.
B.Sc Sem 1 Physics Optics ke answers / solutions kahan milenge?
LUUPDATE ke Most Important Questions course (BA, B.Sc, B.Com Sem I, III & V) me har question ka pura solution milta hai – sirf ₹99 me, LUUPDATE App par.
Ye paper kis group ke liye hai – PCM ya ZBC?
Physics (Optics) LU B.Sc NEP Semester I ke PCM group ke students ke liye hai.
Disclaimer: Ye LUUPDATE team dwara taiyar kiye gaye expected important questions hain (previous year pattern par), Lucknow University ka official question paper nahi. Exam pattern aur syllabus ke liye university ka official notice zaroor dekhein.
