Question:
A convex lens has a focal length of 10 cm. At what distance from the lens should the object be placed so that it forms a real and inverted image 20 cm, away from the lens?
Answer:
Given,
Focal length, f = 10 cm
image distance , v = 20cm
object distance, u ?
From lens formula-
1/f =1/v -1/u
1/10 =1/20 -1/u
from this, we get object distance, u = -20 cm
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