power of lens is -40, what its focal length
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Answer:
Explanation:
Power = 1/ focal length(in m)
-40 =1/f
Therefore f= -1/40 m
f = -2. 25 cm
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Answered by
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Answer:
-2.5cm
Explanation:
power of lens is -40
Since power is negative its a concave lens
Power = 1 / focal length
-40 = 1 / focal length
focal length = 1 / -40
focal length = -0.025m = -2.5cm
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