A person cannot see objects beyond 50cm . The power of the lens to correct the vission
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Given :
focal length = 50 cm
= 50/100 m
= 1/2 m
= 0.5 m
The power cannot see far distances.
Hence the lens will be concave .
We know that concave lens has negative power .
Power = 1 / focal length
= 1 / ( 0.5 m )
= 10 / 5
= 2 D
The power will be - 2 D because it is concave lens .
ANSWER:
-2 D is the power.
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