10 perguntas

Class 10 Light: Mirror Formula, Lens Formula and Power

Class 10 · numericals with the mirror formula, the lens formula, magnification and power of a lens, using the New Cartesian sign convention. CBSE Chapter 9, part 3.

Perguntas

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  1. 1Pergunta 1

    An object is placed 30 cm in front of a concave mirror of focal length 15 cm. Where is the image, and what is it like?

    A30 cm in front of the mirror, real, inverted and the same size
    B15 cm in front of the mirror, real and diminished
    C30 cm behind the mirror, virtual and erect
    DAt infinity
  2. 2Pergunta 2

    An object is placed 15 cm in front of a concave mirror of focal length 10 cm. What is the magnification of the image?

    A+2
    B−0.5
    C−2
    D+0.5
  3. 3Pergunta 3

    An object is placed 30 cm in front of a convex mirror of focal length 15 cm. Where is the image formed?

    A10 cm in front of the mirror
    B30 cm behind the mirror
    C6 cm behind the mirror
    D10 cm behind the mirror
  4. 4Pergunta 4

    A 5 cm tall object is placed in front of a concave mirror and the magnification is −3. Describe the image.

    A15 cm tall, virtual and erect
    B1.7 cm tall, real and inverted
    C15 cm tall, real and inverted
    D3 cm tall, virtual and erect
  5. 5Pergunta 5

    An object is placed 15 cm from a convex lens of focal length 10 cm. Where is the image formed?

    A6 cm from the lens on the same side
    B30 cm from the lens on the other side, real and inverted
    C30 cm from the lens on the same side, virtual and erect
    D10 cm from the lens on the other side
  6. 6Pergunta 6

    An object is placed 10 cm from a convex lens of focal length 20 cm. Describe the image.

    A20 cm from the lens on the other side, real and inverted
    B20 cm from the lens on the same side as the object, virtual, erect and twice the size
    C6.7 cm from the lens, diminished
    DAt infinity
  7. 7Pergunta 7

    The table lists the power of four lenses. What is the focal length of lens B?

    A table of four lenses and their powers in diopters: lens A +2, lens B +5, lens C −3 and lens D +0.5.
    A5 cm
    B50 cm
    C20 cm
    D200 cm
  8. 8Pergunta 8

    A doctor prescribes a lens of power −2.5 D. What kind of lens is it, and what is its focal length?

    AA convex lens of focal length 40 cm
    BA concave lens of focal length 25 cm
    CA convex lens of focal length 2.5 cm
    DA concave lens of focal length 40 cm
  9. 9Pergunta 9

    An object is placed 30 cm from a concave lens of focal length 15 cm. Where is the image formed?

    A10 cm from the lens on the same side as the object
    B30 cm from the lens on the other side
    C10 cm from the lens on the other side
    D15 cm from the lens on the same side
  10. 10Pergunta 10

    The table shows object and image distances measured in an experiment with a convex lens. What is the focal length of the lens?

    A table with three pairs of object distance u and image distance v: −30 and +15, −20 and +20, −15 and +30.
    A20 cm
    B15 cm
    C10 cm
    D5 cm

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