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Graph of position of image vs position o...

Graph of position of image vs position of point object from a convex lens is shown. Then, focal length of the lens is

A

`0.50 pm 0.05 cm`

B

`0.50 pm 0.10 cm`

C

`5.00 pm 0.05 cm `

D

`5 . 00 pm 0.10 cm`

Text Solution

Verified by Experts

The correct Answer is:
C
`(1)/(f) = (1)/(v) - (1)/(u) rArr f = 5 cm `
`rArr (Delta f )/( f^(2)) = (Delta v)/(v^(2)) + (Delta u)/( u^(2))`
`rArr (Delta f)/(25) = (0.1)/((10)^(2)) + (0.1) /((10)^(2)) rArr Delta f = 0.05 `
`rArr f = (5.00 pm 0.05)` cm
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