A screen is placed at 80 cm from an object. The image of the object on the screen is formed by a convex lens at two different location separated by 20 cm. Focal length of lens in cm is
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a
754
b
752
c
354
d
75
answer is A.
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Detailed Solution
focal length in lens displacement method is f=L2-D24L D= 20 cm and L=80 cm
A screen is placed at 80 cm from an object. The image of the object on the screen is formed by a convex lens at two different location separated by 20 cm. Focal length of lens in cm is