Question

25.
Suppose, you held a convex lens very near to an opened book and tried to look at the book
through this lens
(a) What was your observation?
(b) (i) State the nature of the image so formed here.
(ii) Draw the appropriate ray diagram to show formation of the image.
(iii) Write the special name given to this lens when it is used in such a manner.
(c) What will happen to the image if you replace this lens by a concave lens?
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Answer 1

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Answer 2

Convex lens :

Explanation:

• The convex lens converges the incident rays towards the principal axis which is comparatively thick across the middle and thin at the lower and upper edges.

• The edges are curved outward alternately inward.

a)

• When convex lenses are used for observation, the result will be magnified. We tend to see a magnified image of the object.

b)

• i) The nature of the image observed by using a convex lens is virtual.

• ii) Refer to the attachment.
• iii) Another name that was given to the lens will be the converging lens or magnifying lens.

c)

• iii) When a convex lens is replaced by a concave lens, the formed image will be virtual as well as diminished.

Please refer to the following attachment: