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InsemMar 20252019 patternFE

Engineering Physics SPPU Insem Question Paper Mar 2025

All 4 questions from this SPPU insem paper, as printed. Read them here or open the PDF.

Open the PDFMost repeated Engineering Physics questions
Subject code
107002
Pattern
2019 pattern
Exam
Insem
Session
Mar 2025
Max. marks
30
Time
1 Hour
Semester
II
Paper code
[6408]-103

Printed for: F.E. (Common) (Insem)

Instructions to the candidates

  1. Solve (Q.1 OR Q.2) AND (Q.3 OR Q.4)
  2. Figures to the right indicate full marks.
  3. Use of logarithmic tables, slide rule. electronic pocket calculator is allowed.
  4. Assume suitable data, if necessary.

Questions

  1. Q1

    1. a)

      By using neat ray diagram, derive the expression of amplitude for Fraunhoffer’s diffraction due to single slit.

      [6]
    2. b)

      Explain the use of thin film interference to design anti reflection coating.

      [5]
    3. c)

      At what angle should the polarizer and analyzer be oriented so that intensity of natural beam of light is (i) 20% and (ii) 60% of its original intensity.

      [4]

  2. Q2

    1. a)

      When uniform thin film is illuminated with monochromatic light, derive expression for the effective path difference for reflected system.

      [6]
    2. b)

      State and prove law of Malus.

      [5]
    3. c)

      Find the angular position of first minimum in the Fraunhoffer diffraction pattern due to single slit of width 6.6 × l0 –7 m, when illuminated by light of wavelength 6000 AU.

      [4]

  3. Q3

    1. a)

      Explain Construction and working of CO 2 laser.

      Also asked:Mar 2026 ·Feb 2026 ·Oct 2025 ·Apr 2025 ·Sep 2024 ·Mar 2024

      [6]
    2. b)

      What is optical fiber? Differentiate between step index & graded index optical fibers.(any 4 points).

      Also asked:Feb 2026 ·Oct 2025 ·Apr 2025 ·Nov 2024 ·Mar 2024

      [5]
    3. c)

      Define the following and only write down its equations- i) Acceptance angle ii) Numerical aperture for optical fiber. 2

      [4]

  4. Q4

    1. a)

      Define: i) Critical angle ii) Total internal reflection In an optical fiber, the core material has R.I. 1.49 and R.I. of clad material is 1.44. Calculate the value of maximum entrance angle & Numerical aperture.

      [6]
    2. b)

      Explain the use of laser for hologram recording and reconstruction.

      Also asked:Mar 2026 ·Sep 2024 ·Mar 2024 ·Oct 2023 ·Oct 2022

      [5]
    3. c)

      What is stimulated emission of radiations? Explain its role in the laser system. eeee

      [4]