Physics Practice Test – Refraction of Light at Plane and Curved Surfaces (Questions with Answers and Explanations)

If the speed of light in water is 2.26 x 10⁸ ms^-1 and the velocity of light in air is 3.0 x 10⁸ ms^-1. Calculate the refractive index of water. (JAMB 2015)

A. 1.33   B. 1.23   C. 1.45   D. 1.56

An ant is found under a regular glass slab of thickness 10.0cm and refractive index 1.7. Calculate the apparent displacement of the ant if viewed vertically from above the slab. (JAMB 2019)

A. 4.1 cm     B. 3.8 cm    C. 5.9 cm    D. 6.9 cm

The optical phenomenon responsible for rainbow is ________ (JAMB 2018)

A. refraction   B. diffusion   C. reflection   D. dispersion

If a document is to be produced using a duplicating camera, where should document be placed in order to obtain an exact copy? (JAMB 2015)

A. At the point which is twice the focal length of the lens of the camera.
B. At the optical centre of the lens of the camera.
C. Between the principal focus and a point twice the focal length of the lens of the camera.
D. Beyond a point the focal length of the lens of the camera.

An erect image four times as big as the object is fanned by a lens of focal length 15.0 cm. What is the image distance from the lens? (JAMB 2020)

A. 45 cm    B. 30 cm    C. 11.3 cm    D. 18.8 cm