Classify as real or virtual, the image of a candle flame formed on a screen by a convex lens. Draw a ray diagram to illustrate how an image is formed.

A lens forms an erect, magnified and virtual image of an object.

(a) Name the kind of lens.

(b) Where is the object placed in relation to the lens?

(c) Draw a ray diagram to show the formation of image.

(d) Name the device which uses this principle.

A convex lens forms an image of an object equal to the size of the object.

(a) Where is the object placed in front of the lens?

(b) Draw a diagram to illustrate it.

(c) State two more characteristics of the image.

Show by a ray diagram that a diverging lens cannot form a real image of an object placed anywhere on its principal axis.