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Find the distance of the image from obje...

Find the distance of the image from object O, formed by the combination of lenses in the figure :
`f=+10cmf=-10cn f=+30cm`

A

75 cm

B

10 cm

C

Infinity

D

20 cm

Text Solution

Verified by Experts

The correct Answer is:
A
`1^(st)` refraction
`(1)/(v_(1)) - (1)/(-30) = (1)/(10) rArr v_(1) = 15`
For `2^(nd)` refraction
`(1)/(v_(2)) -(1)/(10) = (1)/(-10) rArr v_(2) = oo`
For `3^(rd)` refraction
Ray will converge at focus of `L_(3)` at 30 cm right of it
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