power of a lens is 40, its focal length is :
(a)4m
(b) -40cm
(c)-0.25m
(d) -25m
pls solve it correctly
Answers
Answered by
1
Answer:
power of lens is 40, its focal length is - 0.25m.
Answered by
0
Answer: if P= -40 D. then
f = -0.025 m
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