An object is placed in front of a lens at 10cm from its optic centre. The image is seen on the same side of lens at 60cm distance. What is the nature and focal length of the lens?

Focal length is 12 cm

Nature is Convex lens

Explanation:

Object distance=p= 10 cm

Image distance =q = -60 cm (Image is at the same side)

focal length= f = ?

According to lens equation

1/f = 1/p + 1/q

1/f = 1/10 + 1/(-60)

1/f = 1/10 - 1/60

1/f = 5/60

or

f= 12 cm

(It is a convex lens because focal length is positive)

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