Q. 214.6( 9 Votes )

# The focal length of a lens suggested to a person with hypemetropia is 100cm. Find the distance of near point and power of the lens.

Answer :

A person suffering from hypermetropia uses a biconvex lens.

Given: focal length of lens, f = 100 cm

Power = 100/f = 100/100 = 1 dioptre

Let the distance of near point be d

using formula: f = 25d/(d-25)

100 = 25d/(d-25)

100(d-25) = 25d

100d – 2500 = 25d

100d-25d = 2500

75d = 2500

d = 2500/75 = 33.33 cm

d = 33.33 cm

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