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[2]
A person needs a lens of power $+ 1.5 D$ for correcting his near vision. What is the focal length of the lens required?

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- 66.66 cm

+ 66.66 cm

- 33.33 cm

+ 33.33 cm

answer is B.

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Detailed Solution

A person needs a lens of power

+ 1.5 D

for correcting his near vision. The focal length of the lens required for correcting near vision is

+ 66.66 cm .

We know that focal length (in metres) is the inverse of power of the lens. It is given that the power of the lens is

+ 1.5 D

for correcting near vision.

Focal length (f) in metres = \frac{1}{Power}

\Rightarrow f = \frac{1}{+ 1.5 D}

\Rightarrow f = + 0.6666 m

\Rightarrow f = + 66.66 cm

(as

1 m = 100 cm

)

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