Ques:-A person needs a lens of power -5.5 dioptres for correcting his distant vision. For correcting his near vision he needs a lens of power +1.5 dioptre. What is the focal length of the lens required for correcting distant vision?
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first of the power is
-5.5D
so,
1/f=p
1/p=f ( in cm)
100/-5.5 =f
f=-18.18 cm
If the power is +1.5 Dioptre
100/1.5=f
f=66.66 cm
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