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Q.

A screen is placed 90 cm from an object.  The image of the object on the screen is formed by a convex lens at two different locations separated by 20 cm. Determine the focal length of the lens.

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a

21.4cm  

b

25.4cm  

c

29.4cm 

d

30.4cm

answer is A.

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Detailed Solution

detailed_solution_thumbnail

Given, distance between screen and object a=90cm

Distance between two locations of the lens d=20 cm

f=a2−d24a=902−2024×90=7700360=21.4cm

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