what is the focal length of the lens with power minus 5.5 dioptres
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Power = 1 / focal length ( in metre)
So, - 5.5 D = 1 / f
f = - 1 / 5.5 m
f = - 10 / 55 m
f = - 0.18 m = - 18 cm.
It is a concave lens of focal length 18 cm .
Answered by
1
Answer:-0.18 m = - 18 cm
Explanation:
Power = 1 / focal length ( in metre)
So, - 5.5 D = 1 / f
f = - 1 / 5.5 m
f = - 10 / 55 m
f = - 0.18 m = - 18 cm.
It is a concave lens of focal length 18 cm
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