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Convex lens of power +5" D " and concave...

Convex lens of power `+5" D "` and concave lens with power` -3" D "`are placed together, then the combined power is ………………..

A

5 D

B

`+3` D

C

2 D

D

`-2 `D

Text Solution

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2 D ,
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Knowledge Check

  • Two lenses of power - 15 D and + 5 D are in contact with each other. The focal length of the combination is

    A
    `+ 10`
    B
    `- 20`
    C
    `- 10`
    D
    `+ 20`

  • If two lenses of power + 1.5 and + 1.0 D are placed in contact, then the effective power of combination will be

    A
    2.5 D
    B
    1.5 D
    C
    0.5 D
    D
    3.25 D

  • A lens of power - 2 dioptres is placed in contact with a lens of power + 1 dioptre. The combination will behave like:

    A
    A convergent lens of focal length 100 cm
    B
    A divergent lens of focal length 100 cm
    C
    A divergent lens of focal length 50 cm
    D
    A convergent lens of focal length 50 cm

    • Similar Questions

    Explore conceptually related problems

    The focal length of a concave lens with power -4D is ……………….

    Convex lens: Converging :: Concave lens: ………….

    The power of concave lens is __________.

    The power of lens depends on the length of the lens

    Two lenses of power + 12D and - 2D are combined together. What is their equivalent focal length?

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