Question

A needle 10cm high is placed at 40 cm from a convex lens of focal length 15 cm. find position , nature and size of image.Also draw Ray diagram.

Answer 1

An optical lens is generally made up of two spherical surfaces and one of those surfaces are bent outwards or convex, which is called a convex lens.

When a needle 10 cm high is placed at 40 cm from a convex lens of focal length 15 cm, then, an image is formed at a distance of 40 cm behind the lens.

The Image so formed is real, inverted and diminished and of 6cm.

Answer 2

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