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InsemOct 20252019 patternFE

Engineering Physics SPPU Insem Question Paper Oct 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
Oct 2025
Max. marks
30
Time
1 Hour
Semester
I
Paper code
[6577]-2

Printed for: F.E. (Insem.)

Instructions to the candidates

  1. Answer Q1 or Q2, and Q3 or Q4.
  2. Figures to the right indicate full marks.
  3. Neat diagrams must be drawn wherever necessary.
  4. Assume suitable data, if necessary

Questions

  1. Q1

    1. a)

      Explain with neat labelled diagram interference in thin parallel film of uniform thickness in the reflected system, when it is illuminated by monochromatic light. Calculate total path difference and obtain the conditions of darkness and brightness.

      [6]
    2. b)

      State and Explain Malus Law using neat labelled diagram. Also explain when resultant intensity will be maximum & minimum.

      [5]
    3. c)

      In a plane diffraction grating, the angle of diffraction for the second order principal maximum for the light of wavelength 5×10 –5 cm is 30°. Calculate the number of lines per centimeter of the grating surface.

      Also asked:Oct 2023

      [4]

  2. Q2

    1. a)

      Explain Huygens theory of double refraction for uniaxial crystal.

      Also asked:Mar 2026 ·Feb 2026 ·Apr 2025 ·Nov 2024 ·Mar 2024 ·Oct 2023 ·Oct 2022

      [6]
    2. b)

      What is Interference? Explain with the suitable diagram, how interference is used in anti-reflective coating.

      [5]
    3. c)

      A parallel beam of light of wavelength 5893 Å is incident on a thin film of Refractive index 1.5, such that the angle of refraction is 60°. Find the minimum thickness of the uniform thin film which will make it to appear dark by reflection.

      [4]

  3. Q3

    1. a)

      Explain construction of optical fiber in brief. Explain the role of (i) acceptance angle (ii) critical angle and (iii) total internal reflection in the propagation of light in the optical fiber.

      [6]
    2. b)

      What is holography? Differentiate between photography and holography (Any two points).

      [5]
    3. c)

      Explain in brief (i) Pumping (ii) Metastable state

      [4]

  4. Q4

    1. a)

      Explain the principle, construction and working of CO 2 laser with neat labelled diagram.

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

      [6]
    2. b)

      Distinguish between step index fiber and graded index fiber. (Any five points).

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

      [5]
    3. c)

      The difference in Refractive index of core and cladding is 0.08 and while their addition is 2.78. Calculate Numerical Aperture (NA) and Acceptance angle. 

      [4]