Question

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Answer 1

☆ Given :-

Focal length of a converging lens = 20 cm

Object distance = 60 cm

☆ To find :-

where image will be formed =?

Nature of the image formed = ?

☆ Solution :-

Focal length is the distance between centre of curvature and the focus

So ; 2F becomes = 2 × 20 = 40 cm

The object is kept at 60 cm , which is beyond the 2F (40cm)

Hence the object is beyond the focus.

=> Nature of the image formed :

• Real and inverted
• Image formed is smaller than the object.

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➡The focal length of a lens is the distance of an object and the image formed .

An convex lens is an converging lens.

More to know :-

When lens is dipped in a liquid of higher refractive index the focal length increases Which enables the convex lens behave as concave lens and vice versa.