Physics, asked by khanfarhan2501, 1 year ago

A nearsighted man can clearly see objects only upto a distance of 100 cm and not beyond this. What is the number of the spectacles lens necessary for the remedy of this defect

Answers

Answered by snehakotak5704
1

Answer:

To correct nearsightedness, an object placed at infinity must form an image 100 cm by the corrective lens. If ff is the focal length of the lens,

\dfrac{1}{v}-\dfrac{1}{u}=\dfrac{1}{f}

v

1

u

1

=

f

1

\dfrac{1}{-100}-\dfrac{1}{-\infty}=\dfrac{1}{f}

−100

1

−∞

1

=

f

1

Therefore focal lngth of correcetive lens is -1m.−1m.

Hence the power = -1D =−1D

Number of the spectacle=-1=−1

Answered by SOURAVSKEHAWAT
0

Answer:

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