a) Which type of lens is used in a magnifying glass?
b) By drawing a ray diagram, explain the formation of an image by a simple magnifying lens.
[5 MARKS]

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Solution

part a): 1 Mark
part b): 4 Marks

a) A convex lens is used in a magnifying glass.

b) Consider an object AB lying between the focus $F_{1}$ and the optical centre O of the lens. A ray of light parallel to the principal axis after refraction through the lens passes through $F_{2}$ . Another ray from the same point after passing through the optical centre goes straight along its path. The two rays do not meet, but when produced backwards they appear to meet at A' which is the virtual

image of the point A. From A', draw A' B' perpendicular to the principal axis. Thus, A' B' is the virtual, magnified and erect image of the object AB.

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Similar questions

Q. Draw a ray diagram to show how a convex lens can be used as a magnifying glass.

A lens forms an upright and magnified image of an object.

(a) Name the lens.

(b) Draw a labelled ray diagram to show the image formation.

(a) Explain what is meant by a virtual, magnified image. (b) Draw a ray diagram to show the formation of a virtual magnified image of an object by a convex lens. In your diagram, the position of object and image with respect to the principal focus should be shown clearly. (c) Three convex lenses are available having focal lengths of 4 cm, 40 cm and 4 m respectively. Which one would you choose as a magnifying glass and why ?

Q. Draw ray diagrams to show the formation of three times magnified (a) real, and (b) virtual image of an object by a converging lens. Mark the positions of O, F and 2F in each diagram.

Draw ray diagrams to represent the nature, position and relative size of the image formed by a convex lens for the object placed : (a) at $2 F_{1}$ , (b) between $F_{1}$ and the optical centre O of the lens. Which of the above two cases shows the use of the convex lens as a magnifying glass ? Give reasons for your choice.

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a) Which type of lens is used in a magnifying glass? b) By drawing a ray diagram, explain the formation of an image by a simple magnifying lens. [5 MARKS]

a) Which type of lens is used in a magnifying glass?
b) By drawing a ray diagram, explain the formation of an image by a simple magnifying lens.
[5 MARKS]