Pick and Answer

A concave lens with a focal length of 25 cm forms a virtual image of an ant at a distance of 20 cm from the optical centre of the lens. What is the original position of the ant?

A thin convex lens has a focal length of 12 cm. Determine the characteristics and the position of the images formed and linear magnification when the object distance is 18 cm.

An object with a height of 9 cm is placed 60 cm from a concave lens with a focal length of 30 cm. Determine the position of the image formed. State the characteristics of the image formed.

A thin convex lens has a focal length of 12 cm. Determine the characteristics and the position of the images formed and linear magnification when the object distance is 4 cm.

Figure 6.37 shows thin convex lens with a focal length of 12 cm. X and Y are 24 cm and 18 cm respectively from the lens. A cricket takes 6 seconds to move from X to Y. What is the speed of of the cricket’s image?

What is the image distance?

An object is placed 30 cm from a concave lens with a focal length of 20 cm. How far from the lens is the image? What magnification and characteristics of the image?

An object is placed 10 cm from a convex lens with a focal length of 20 cm. How far is the object from the lens?

An object is placed 30 cm from a convex lens with a focal length of 20 cm. How far from the lens is the image?

Diagram shows the formation of an image by a convex lens. The focal length of the lens is 6 cm and the height of the object is 2 cm. Calculate the image distance.