A force of 5 N is applied on a wrench at a distance of 10 cm. Calculate the moment of force.
An object is placed at a distance of 10 cm from a convex mirror of focal length 5cm.Calculate the distance of an image from mirror.
When an object is placed at a distance of 15 cm from a concave mirror, its image is formed at 10 cm in front of the mirror. Calculate the focal length of the mirror.