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  • An object is placed on the principal axis of convex lens of focal length 10 cm as shown. A plane mirror is placed on the other side of lens at a distance of 20 cm. The image produced by the plane m

An object is placed on the principal axis of convex lens of focal length 10 cm as shown. A plane mirror is placed on the other side of lens at a distance of 20 cm. The image produced by the plane mirror is 5 cm inside the mirror. The distance of the object from the lens is cm

Option: 1

30


Option: 2

-


Option: 3

-


Option: 4

-


Answers (1)

best_answer

\begin{aligned} & \therefore \text { for lens } v=20-5=15 \mathrm{~cm} \\ & \frac{1}{\mathrm{v}}-\frac{1}{\mathrm{u}}=\frac{1}{\mathrm{f}} \\ & \frac{1}{15}-\frac{1}{\mathrm{u}}=\frac{1}{10} \\ & \frac{1}{\mathrm{u}}=\frac{1}{15}-\frac{1}{10}=\frac{2-3}{30}=\frac{1}{30} \\ & \mathrm{u}=-30 \\ & =30 \end{aligned}

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Shailly goel

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