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Physics
The power of a corrective lens is -4.0 D. The lens is
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Q. The power of a corrective lens is $-4.0 \, D$. The lens is
KEAM
KEAM 2022
A
convex lens of focal length $+25 \,cm$
B
concave lens of focal length $-25\, cm$
C
convex lens of focal length $+4\, cm$
D
concave lens of focal length $-4\, cm$
E
convex lens of focal length $+20 \,cm$
Solution:
Correct answer is (b) concave lens of focal length $-25\, cm$