a focal length of a converging lens is 20 CM where will the image be formed if an object is placed at 60 cm from the lens
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Answered by
1
As the focal length is 20cm so 2f is 40cm .
as the object is placed 60cm apart it means it is beyond 2f.
We know that when object is placed beyond 2f so the image will be form between f and 2f.
HOPE IT HELPS
as the object is placed 60cm apart it means it is beyond 2f.
We know that when object is placed beyond 2f so the image will be form between f and 2f.
HOPE IT HELPS
Answered by
4
The lens formula is:
1/f = 1/u + 1/v where :
f = focal length
u = object distance
v = image distance
In this question :
f = 20cm
u = 60cm
Substituting the values in the formula to get v:
1/20 = 1/60 + 1/v
1/v = 1/20 - 1/60
LCM = 60
(3 - 1)/60 = 2/60 = 1/30
1/30 = 1/v
v = 30cm
1/f = 1/u + 1/v where :
f = focal length
u = object distance
v = image distance
In this question :
f = 20cm
u = 60cm
Substituting the values in the formula to get v:
1/20 = 1/60 + 1/v
1/v = 1/20 - 1/60
LCM = 60
(3 - 1)/60 = 2/60 = 1/30
1/30 = 1/v
v = 30cm
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