Gce Model Questions Vol1 2018 Physics Question 29

Practice objective / multiple choice question 29 from the 2018 Gce Model Questions Vol1 Physics examination.

Gce Model Questions Vol1 2018 Physics Objective / Multiple Choice Medium Difficulty
Question 29 GCE_MODEL_QUESTIONS_VOL1 • 2018 • PHYSICS • objective

A thin film of oil (\(n=1.45\)) lies on water (\(n=1.33\)) and is illuminated from air at normal incidence. For monochromatic light of wavelength \(\lambda = 600\ \text{nm}\) the film produces a bright fringe of order \(m=3\). (a) Find the minimum thickness \(t\) of the oil film. (b) If the illumination is changed to light of wavelength \(\lambda' = 500\ \text{nm}\) while the film thickness remains the same, what integer order of bright fringe is nearest to being observed?

Answer Options

A. t = 6.5×10⁻⁷ m; nearest bright order for 500 nm = 3
B. t = 7.2×10⁻⁶ m; nearest bright order for 500 nm = 2
Correct Answer C. t = 7.2×10⁻⁷ m; nearest bright order for 500 nm = 4
D. t = 8.0×10⁻⁷ m; nearest bright order for 500 nm = 5
Correct Answer
C
Correct Option:
t = 7.2×10⁻⁷ m; nearest bright order for 500 nm = 4

About This Question

This is Gce Model Questions Vol1 2018 Physics Question 29. It is one of the objective questions from the 2018 Gce Model Questions Vol1 Physics examination.

Difficulty level: Medium .

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