A converging lens of focal length `5.0cm` is placed in contact with a diverging lens of focal length `10.0cm.` Find the combined focal length of the system.A. `+ 10.0 cm`B. `- 10.0 cm`C. 5.0 cmD. `- 5 cm`

A converging lens of focal length `5.0cm` is placed in contact with a

1.	A converging lens of focal length `5.0cm` is placed in contact with a diverging lens of focal length `10.0cm.` Find the combined focal length of the system.A. `+ 10.0 cm`B. `- 10.0 cm`C. 5.0 cmD. `- 5 cm`
Answer» Correct Answer - A Here, `f_(1)=+5.0 cm` and `f_(2)=-10.0 cm` Therefore, the combined focal length F is given by `(1)/(F)=(1)/(f_(1))+(1)/(f_(2))=(1)/(5.0)-(1)/(10.0)=+(1)/(10.)` `therefore " " F = +10.0 cm` i.e., the combination behaves as a converging lens of focal length 10.0 cm.

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A converging lens of focal length `5.0cm` is placed in contact with a diverging lens of focal length `10.0cm.` Find the combined focal length of the system.A. `+ 10.0 cm`B. `- 10.0 cm`C. 5.0 cmD. `- 5 cm`

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