Gce Model Questions Vol1 2019 Physics Question 47

Practice objective / multiple choice question 47 from the 2019 Gce Model Questions Vol1 Physics examination.

Gce Model Questions Vol1 2019 Physics Objective / Multiple Choice Medium Difficulty
Question 47 GCE_MODEL_QUESTIONS_VOL1 • 2019 • PHYSICS • objective

A thin convex lens of focal length \(f = 0.20\) m is used to form an image of a distant object (effectively at infinity). A plane‑parallel glass plate of thickness \(t = 2\) mm and refractive index \(n = 1.50\) is placed directly in front of the lens, covering its whole aperture. Assuming paraxial optics, calculate the shift of the focal point caused by the plate and give the new effective focal length of the lens‑plus‑plate system.

Answer Options

Correct Answer A. Shift = 0.667 mm towards the lens; new focal length \(f' = 0.19933\) m.
B. Shift = 0.667 mm away from the lens; new focal length \(f' = 0.20067\) m.
C. Shift = 1.000 mm towards the lens; new focal length \(f' = 0.19800\) m.
D. Shift = 0.500 mm towards the lens; new focal length \(f' = 0.19950\) m.
Correct Answer
A
Correct Option:
Shift = 0.667 mm towards the lens; new focal length \(f' = 0.19933\) m.

About This Question

This is Gce Model Questions Vol1 2019 Physics Question 47. It is one of the objective questions from the 2019 Gce Model Questions Vol1 Physics examination.

Difficulty level: Medium .

View More Gce Model Questions Vol1 2019 Physics Questions More Gce Model Questions Vol1 Practice Questions Back to Questions

Master the Exam!

You've seen a preview, but there are thousands more questions plus AI tutor to break down complex solutions.

Unlock Full Access Available for Android & Windows
Chat with Support