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

Determine the focal length of a thin converging lens if the power is 5.0 dioptres.

A. 0.1 m    B. 0.2 m    C. 2.0 m    D. 2.5 m

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

Which of the following remains unchanged when light travels from one medium to another? (JAMB 2022)

A. Frequency   B. Velocity   C. Wavelength    D. None

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

When a man stands in water, his legs appear shorter, which principle causes this? (JAMB 2022)

A. Reflection    B. Polarisation    C. Refraction    D. Diffraction