Question

5.
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

Explanation:

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