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Practice Questions – Mirror Formula & Magnification


Practice Questions – Mirror Formula & Magnification

A. Conceptual Questions

  1. State the mirror formula. Write the meaning of each term.
  2. A concave mirror forms an image at infinity when the object is placed at a certain point. Where is the object placed?
  3. Why can a convex mirror never form a real image of an object?
  4. If the magnification produced by a mirror is +0.5, identify the type of mirror and nature of the image.
  5. What does a magnification of –3 signify about the image?

B. Numerical Questions

  1. An object is placed at a distance of 30 cm from a concave mirror of focal length 15 cm. Find the position and nature of the image.
  2. A convex mirror has a focal length of 20 cm. An object is placed at 30 cm in front of it. Find the position of the image and the magnification.
  3. An image is formed by a concave mirror at a distance of 24 cm from the mirror. If the object is placed at 12 cm and the image is real, find the focal length of the mirror.
  4. A concave mirror produces an image twice the size of the object when the object is at 10 cm from the mirror. Calculate the focal length of the mirror.
  5. The magnification produced by a spherical mirror is +0.4. If the object is at a distance of 20 cm from the mirror, find the focal length.

C. Higher Order Thinking Questions (HOTs)

  1. A dentist uses a concave mirror of focal length 10 cm. At what distance should the dentist hold the mirror from the tooth to get a magnified, erect image of the tooth?
  2. A convex mirror used in a vehicle gives an image at 15 cm behind the mirror when the object is 30 cm away. Find the focal length of the mirror.
  3. A concave mirror forms an image of the same size as the object. Where is the object placed? What is the magnification in this case?
  4. For a concave mirror, it is observed that when an object is placed at 60 cm, its image is formed at 30 cm in front of the mirror. Find the focal length. Also calculate magnification.


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