Physics q350

350A person can see clearly only the objects situated in the range of 50 cm to 300 cm. He went to an Optometrist who prescribed him a lens of certain power to increase the maximum distance of his vision to infinity, i.e. it corrected the near - sightedness. However, upon using the prescribed lens the person discovered that the near point of his vision has shifted from 50 em to a distance 'd'. What is the value of d? (NTSE Stage-II,2015-16)

Option : A
Explanation :

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