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

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

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

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

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

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

A converging lens has a focal length of 20 cm. The lens forms a real inverted image of the same size as the object when the object distance from the lens is? (JAMB 2021)

A. 40cm    B. 30cm    C. 20 cm    D. 10 cm