An object is placed at a distance of 30 cm from a convex lens,
and if image forms at a distance of 20 cm on the other side of
lens. Find the focal length of the lens
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0
Answer:
Explanation:
n the given problem
Object distance, u = - 30 cm (from sign convention)
Image distance, v = ?
Focal length of the lens f = 20 cm
From lens formula
1f=1v−1u
120=1v−1−30
120=1v+130
1v=120−130
1v=30−2030×20=10600
v=60010=60 cm .
Magnification, m = height of the imageheight of the object =vu
M=60−30=−2.
Negative sign indicates that the image is inverted . Since, m is greater than one, the image is magnified.
Since v is positive, the image is real.
The image is formed 60 cm on the other side of the lens and it is real, inverted and magnified
Answered by
1
Answer:
1/30-1/20
=20+30/60
50/60
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