Two lenses are placed in contact with each other and the focal length of the combination is 80 cm. If the focal length of one is 20 cm, then the power of the other will be?
Answers
Answered by
33
> 1/f = 1/f1 + 1/f2
> 1/80 = 1/20 + 1/f2
> f2 = -80/3cm
.°. P = 100/f2 = 100×3/-80
= -3.75D
> 1/80 = 1/20 + 1/f2
> f2 = -80/3cm
.°. P = 100/f2 = 100×3/-80
= -3.75D
Answered by
4
Given,
Focal length(Combined) =80cm
Focal length of one=20cm
To find,
Power of other =?
Solution,
Power=1/f(in metre)
=1/0.80-0.20(metre)
=1/0.60(metre)
=1.66666667metre
Hope you like my answer and brainliest it
Focal length(Combined) =80cm
Focal length of one=20cm
To find,
Power of other =?
Solution,
Power=1/f(in metre)
=1/0.80-0.20(metre)
=1/0.60(metre)
=1.66666667metre
Hope you like my answer and brainliest it
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