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  • Two convex lenses of focal length 20 cm each are placed coaxially with a separation of 60 cm between them. The image of the distant object formed by the combination is at ________ cm from the first

Two convex lenses of focal length 20 cm each are placed coaxially with a separation of 60 cm between them. The image of the distant object formed by the combination is at ________ cm from the first lens.

 

Option: 1

100


Option: 2

-


Option: 3

-


Option: 4

-


Answers (1)

best_answer

For I \ { }^{\text {st }} lens\\ $$ \begin{aligned} & \frac{1}{\mathrm{~V}_1}-\frac{1}{\infty}=\frac{1}{20} \\ & \mathrm{~V}_1=20 \mathrm{~cm} \end{aligned}\\ $$ For 2^{\text {nd }} lens \\ $$ \begin{aligned} & \frac{1}{\mathrm{~V}_2}-\frac{1}{-40}=\frac{1}{20} \\ & \mathrm{~V}_2=40 \mathrm{~cm} \end{aligned}\\ So \, \, distaance =40+60=100 \mathrm{~cm}

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Divya Prakash Singh

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