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Q.

A man who wears glasses of power $3 D$ must hold a newspaper at least $25 cm$ away to see the print clearly. How far would the newspaper be placed so that even if he looks off the glasses he gets a clear vision?

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a

v = 1 m

b

v = - 1 m

c

v = 2 m

d

None of the these

answer is B.

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Detailed Solution

A man who wears glasses of power

3 D

must hold a newspaper at least

25 cm

away to see the print clearly. If he looks off the glasses and still wants a clear vision he would keep the newspaper at

v = - 1 m .

Given,

u = - 0.25 m

and

f = \frac{1}{P} = \frac{1}{3} m

f = focal length

P = power of lens

u = object distance

v = image distance

By lens formula-

P = \frac{1}{f} = \frac{1}{v} - \frac{1}{u}

So, we get-

3 =

\frac{1}{v}

- \frac{1}{- 0.25}

V = - 1 m

.

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A man who wears glasses of power 3 D must hold a newspaper at least 25 cm away to see the print clearly. How far would the newspaper be placed so that even if he looks off the glasses he gets a clear vision?