Question

a person with glasses cannot see the object placed beyond 60 CM in order to see the objects clearly he must use the lens of power​

Answer 1

Explanation:

That lens should be given to the person which forms the image of an object at infinity at distance 60 cm in front of the eye.

Hence, u=−∞ and v=−60cm

Now,

f/

1

=

v/

1

−

u/

1

⟹

f/

1

=

60/

−1

−

−∞/

1

⟹f=−60cm

P=

f(cm)

100

=

60/

−100

=

⟹P=−1.66666D

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