Question

We are given a convex lens of focal length 20 cm. Draw ray diagrams to show
the nature, size and position of the image formed when the object is kept at a
distance of
(a) 55 cm (b) 35 cm (c) 15 cm
from the lens.
(Note: For drawing ray diagrams, use an appropriate scale.)​

Answer 1

Answer:

Given focal length of the lens is f= 20cm   so 2f =40cm

Case1   When the object is kept at a distance of 55cm from the lens the object is placed beyond 2f

so the image is formed between f and 2f and the nature of the image  is real inverted and diminished.

Case2    When the object is kept at a distance of 35cmfrom the lens then the object is between  f and 2f

So the image is formed beyond 2f and the nature of the image is real inverted and enlarged.

Case3 When the object is placed at a distance of 15cm from the lens then the object is placed between the optical center and f.

so the nature of the image is virtual erect and enlarged.

Explanation:

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Answer 2

Answer:

Here your answer of your question.

And I give ray diagram also.