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A convex lens is in contact with concave...

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

A

`-75,50`

B

`-10,15`

C

`75,50`

D

`-15,10`.

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MODERN PUBLICATION-UNIT TEST -06-EXERCISE
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  2. A double convex lens made from a material of refractive index mu1 is i...

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  3. A convex lens is in contact with concave lens .The magnitude of the ra...

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  4. A hollow doublew concave lens is made of very thin transparent materia...

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  5. A biconvex of focal length forms a circular image of radius r of sun ...

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  6. A real image of a distant object is formed by a plano-convex lens on i...

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  8. A ray of light is incident on an equilateral glass prism placed on a h...

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  9. A given ray of light suffers minimum deviation in an equilateral prism...

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  10. A thin prism of angle 15^@ made of glass of refractive index = 1.5 is...

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