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A concave lens of focal length 12 cm and...

A concave lens of focal length 12 cm and a convex lens of focal length 20 cm are kept in contact with each other .
Find the focal length of the combination .

Text Solution

AI Generated Solution

To find the focal length of the combination of a concave lens and a convex lens that are kept in contact, we can use the formula for the focal length of two lenses in contact: \[ \frac{1}{f} = \frac{1}{f_1} + \frac{1}{f_2} \] Where: - \( f \) is the focal length of the combination, ...
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A concave lens of focal length 12 cm and a convex lens of focal length 20 cm are kept in contact with wach other. (i) Find the focal length of the combination. (ii) What will be the behaviour fo the combination ?

If the convex lens of focal length 10 cm and a concave lens of focal length 50 cm are kept in contact with each other. What will be the focal length of the combination ?

Knowledge Check

  • A concave lens of focal length 25 cm and a convex lens of focal length 20 cm are placed in contact with eachother. What is the power of this combination ? Also, calculate focal length of the combination.

    A
    `0.5D` , `10cm`
    B
    `1D` , `100cm`
    C
    `-1D` , `100cm`
    D
    `1.5D` , `50cm`

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    If a convex lens of focal length 20 cm and a concave lens of focal length 30 cm are kept in contact with each other (i) what will be the focal length of the combination ? (ii) what will be the power of the combination ? (iii) what will be behaviour of the combination ?

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