Physics

9th

grade

Image

S3 Phy Images formed by concave and convex lens

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10 questions

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  • 1. Multiple Choice
    45 seconds
    1 pt
    Image

    Which of the followings is/are correct?

    F is focal length

    F is principal focus

    O is optical centre

    The lens in the diagram is a convex lens

  • 2. Multiple Choice
    30 seconds
    1 pt
    Image

    Which of the followings describe the photo correctly?

    The lens in the photo are concave lens.

    The image is virtual, inverted and diminished.

    The light ray bends and hits the focus after travelling in parallel to the principal axis.

    The photo demonstrates the case of u(object distance) < 2f (focal length)

  • 3. Multiple Choice
    45 seconds
    1 pt

    Which of the followings concerning lens formula is/are correct

    The equation is 1v+1u=1f\frac{1}{v}+\frac{1}{u}=\frac{1}{f} , while u is object distance, v is image distance and f is focal length.

    The focal length can be negative.

    When the image distance is minus (e.g. v=-1) the image is virtual, and when positive (e.g. v=1), the image is real.

    We cannot find the focal length using the lens formula when given the image distance and object distance

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