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A bi-convex lens is formed with two thin plano-convex lenses as shown in the figure. Refractive index n of th efirst lens is 1.5 and that of the second lens if 1.2 Both the curved surfaces are of the same radius of curvature `R=14cm. ` For this bi-convex lens, for an object distance of 40cm, the image distance will be
image
A. `.280.0cm`
B. `40.0cm`
C. `21.5cm`
D. `13.3cm`

1 Answer

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Best answer
Correct Answer - B
`(1)/(f_(1))=(1.2-1)((1)/(oo)-(1)/(-14))=(0.2)/(14)`
`(1)/(f_(2))=(1.5-1)((1)/(14)-(1)/(oo))=(0.5)/(14)`
`(1)/(f_(eq))=(0.7)/(1.4)=(1)/(20)`
`(1)/(v)-(1)/(-40)=(1)/(20)`
`v=40cm`

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