An object is placed in front of concave mirror 20 cm away from it. If its focal length is 40 cm , locate the position of image and its nature.

An object is placed 8 cm away in front of a concave mirror of focal length 5 cm. Find out the position of image and magnification. Find out whether the image is inverted or erect by drawing the ray diagram on a graph paper.

A virtual image of an object is formed at 30 cm away from a lens when an object is kept at a distance 20 cm away from it . What is the focal length of the lens ? Find the magnification of the image ?

An object of height 3 cm is placed in front of a convex lens of focal length 20 cm at a distance of 30 cm. What is the nature of the image?