Concave Mirror Optics Quiz
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Questions and Answers

What happens to the image size when an object is placed 20cm in front of a concave mirror with a focal length of 15cm and forms a virtual image twice the size of the object?

  • The image size is equal to the object size.
  • The image size is twice the object size. (correct)
  • The image size decreases to half of the object size.
  • The image size is three times the object size.

    • If an object placed at a distance of 60cm from the pole of a concave mirror creates an image at a distance of 30cm from the pole, what is the magnification of the image?

  • 1
  • 1/2
  • 3
  • 2 (correct)

    • What ratio of the size of the image to the size of the object will result from a concave mirror if the distance from the object to the principal focus is 30cm and the focal length is 10cm?

  • 1:3
  • 2:1 (correct)
  • 1:2
  • 3:1

    • For a concave mirror with a focal length of 20cm, if the object is positioned at 60cm, what will be the nature of the image formed?

    <p>Real and inverted</p> Signup and view all the answers

    When an object measuring 2mm is placed at the axis of a concave mirror with a radius of curvature of 40cm, what will be the behavior of the formed image?

    <p>The image will be real and magnified.</p> Signup and view all the answers

    What will be the height of the image when an object of 2mm is placed on the axis of a convex mirror at a distance of 20cm with a radius of curvature of 40cm?

    <p>6mm</p> Signup and view all the answers

    What is the ratio of the size of the image to the size of the object for a concave mirror with focal length f and object distance x?

    <p>$\frac{f}{f+x}$</p> Signup and view all the answers

    If a point object is placed 60cm from the principal focus of a concave mirror and its image is formed at the point of the object, what is the focal length of the mirror?

    <p>30cm</p> Signup and view all the answers

    Given an object placed in front of a concave mirror with focal length 20cm, which distance could result in an image size that is 3 times the size of the object?

    <p>$\frac{80}{3}$ cm</p> Signup and view all the answers

    According to the sign convention for mirrors, which statement about distance measurement is incorrect?

    <p>Distance measured below the principal axis are positive.</p> Signup and view all the answers

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