We are given a convex lens of focal length 20cm .Draw a ray diagram to

1.	We are given a convex lens of focal length 20cm .Draw a ray diagram to show the nature, size and position of the image formed when the object is kept at a distance of 55 cm,35 cmand 15 cm from the lens.
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.

We are given a convex lens of focal length 20cm .Draw a ray diagram to show the nature, size and position of the image formed when the object is kept at a distance of 55 cm,35 cmand 15 cm from the lens.

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.

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