А A convex lens of focal length 20 cm in placed in between object in Screen whose distance is 90cm then find the obiect and image distances respectively
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Answer:
21.4 cm.
Explanation:
The image of the object can be located on the screen for two-position of convex lens such that u and v are exchanged.
The separation between two positions of the lens is, d= 20 cm
From the figure,
u1+v1=90cm
v1−u1=20cm
Solving,
v1=55cm, u1=35cm
From lens formula,
v1−u1=f1
551−−351=f1
⇒f1=551+351=9055×35
⇒f=21.4cm
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