Gce Model Questions Vol1 2023 Physics Question 16

Practice objective / multiple choice question 16 from the 2023 Gce Model Questions Vol1 Physics examination.

Gce Model Questions Vol1 2023 Physics Objective / Multiple Choice Hard Difficulty
Question 16 GCE_MODEL_QUESTIONS_VOL1 • 2023 • PHYSICS • objective

A thin film of oil (refractive index \(n=1.45\)) is lying in air and is illuminated at normal incidence by monochromatic light. For light of wavelength \(600\,\text{nm}\) the reflected light shows a bright fringe (constructive interference) and for light of wavelength \(500\,\text{nm}\) a dark fringe (destructive interference). Assuming the only phase change occurs at the air‑oil surface, determine the minimum possible thickness of the oil film. Give your answer in nanometres (nm).

Answer Options

A. 6.0×10^{2} nm (≈600 nm)
B. 5.8×10^{2} nm (≈580 nm)
Correct Answer C. 5.2×10^{2} nm (≈517 nm)
D. 4.8×10^{2} nm (≈480 nm)
Correct Answer
C
Correct Option:
5.2×10^{2} nm (≈517 nm)

About This Question

This is Gce Model Questions Vol1 2023 Physics Question 16. It is one of the objective questions from the 2023 Gce Model Questions Vol1 Physics examination.

Difficulty level: Hard .

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