Q31 of 284 Page 240

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 2F1


(b) Between F1 and the optical centre 0 of the lens.


Which of the above two cases shows the use of convex lens as a magnifying glass? Give reasons for your choice.

(a) Object at 2F1 :


(b) Object between F1 and the optical centre O of the lens :



The case 2 shows the use of convex lens as a magnifying glass as the image formed is erect and magnified.


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30

State whether concave lens has a real focus or a virtual focus.

 30

List some things that concave lens and convex mirror have in common.

 32

An object is placed well outside the principal focus of a convex lens. Draw a ray diagram to show how the image is formed, and say whether the image is real or virtual.

 32

What is the effect on the size and position of the image of moving the object?

(i) towards the lens, and


(II) Away from the lens?