Two plane mirrors are inclined at an angle 20° to each other. Determine the number of images formed when an object is placed between them.

A converging lens of focal length 10cm forms an erect image three times the size of the real object. Calculate the distance between the image and the object.

The inverse of the time required for a wave to complete one full cycle is called

Two bar magnets are placed near each other. Which of the following diagrams correctly illustrates the magnetic field pattern formed by the pair?

The force per unit charge experienced at a point in a field is the