2.What is the focal length of a concave lense with number -5D? [A] 5 cm [B] 10 cm [C] 15 cm [D] 20 cm
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0
Answer:
20 CM is correct answer please mark me brilliant
Answered by
0
Answer:
Focal length of the lens f=10 cm =0.1 m
Power of lens P=
f
1
∴ P=
0.1
1
=10 D
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