A convex lens is in contact with a concave lens- The magnitude of the ratio of their focal lengths is 2-3- Their equivalent focal length is 30cm- What are their individual focal lengths-

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Standard XI

Physics

Power and Thin Lenses in Contact

A convex lens...

Question

A convex lens is in contact with a concave lens. The magnitude of the ratio of their focal lengths is $\frac{2}{3}$ . Their equivalent focal length is 30cm. What are their individual focal lengths?

-15, 10

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-10, 15

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75, 50

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-75, 50

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Solution

The correct option is D -75, 50
Watch the next video for the solution.

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A convex lens is in contact with a concave lens. The magnitude of the ratio of their focal lengths is 23. Their equivalent focal length is 30cm. What are their individual focal lengths?

The correct option is D -75, 50Watch the next video for the solution.

A convex lens is in contact with a concave lens. The magnitude of the ratio of their focal lengths is $\frac{2}{3}$ . Their equivalent focal length is 30cm. What are their individual focal lengths?

The correct option is D -75, 50
Watch the next video for the solution.