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InterviewSolution
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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 A. `.280.0cm`B. `40.0cm`C. `21.5cm`D. `13.3cm` |
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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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