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Question
A person suffering from short-sightedness can see clearly only upto a distance of 2 metres. Find the power of the lens required to correct his vision
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Solution
The correct option is A -0.5 D
To correct the vision, the object is placed at infinity u=−∞ so that its image is formed at his far point, i.e. v=−2 mRequiredlensisaconcavelens.v=−2 mu=∞Now,using Lens Formula1v−1u=1f1−2−1−∞=1ff=−2mPower P=1f=1−2=−0.5DHence, the option A is the correct answer.
To correct the vision, the object is placed at infinity u=−∞ so that its image is formed at his far point, i.e. v=−2 m
Requiredlensisaconcavelens.v=−2 mu=∞Now,using Lens Formula1v−1u=1f1−2−1−∞=1ff=−2mPower P=1f=1−2=−0.5DHence, the option A is the correct answer.
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