2(a)
The power of a lens is –5D.
(i) Find it's focal length.
(ii) Name the type of lens.
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(i) Given, P = -5D
Focal length f = $\frac{1}{P}$ = $\frac{1}{-5}$ = -0.2 m = -20 cm
(ii) The lens is concave.
The power of a lens is –5D.
ICSE Class 10 Physics PYQ · 2018 Paper · Section I