NCERT Solution for Class 10 Science Chapter 11
The Human Eye and the Colorful World
NCERT Books for Session 2022-2023
CBSE Board and UP Board
Exercises Questions
Page No-198
Questions No-5
(i) distant vision, and (ii) near vision?
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
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For distant vision = −0.181 m, for near vision = 0.667 m
The power P of a lens of focal length f is given by the relation
P = 1/f(in metres)
(i) Power of the lens used for correcting distant vision = −5.5 D
Focal length of the required lens, f =1/P
F = 1/-5.5 = -0.181ₘ
The focal length of the lens for correcting distant vision is −0.181 m.
(ii) Power of the lens used for correcting near vision = +1.5 D
Focal length of the required lens, f =1/P
F = 1/1.5 = +0.667ₘ
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(i) f=1/P=−1/5.5=−0.1818m.
f=−18.18cm.
(ii) f=1/P=1/1.5=0.666m.
f = 66.6cm.