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Standard X
Science
NCERT
Question
Find the focal length of a lens of power (-2.0)D. What type of lens is this?
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Solution
Verified by Toppr
Given, lens of power
P
=
(
−
2.0
)
D
Power,
P
=
1
f
f
=
1
p
=
1
−
2
f
=
−
0.5
m
Since focal length is negative, it is concave lens.
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