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A convex mirror is used as a driving mirror because-2…

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PHYSICS

A convex mirror is used as a driving mirror because

  • I. Its image is erect
  • II. It has a large field of view
  • III. It has a long focal length

Identify the correct statement(s).

A. I and III only

B. I and II only

C. II and III only

D. I, II, and III only

E. I only

QUICK ANSWER…

B

DETAILS…  

Images formed by convex mirrors are:

  • Erect
  • Diminished and
  • Virtual

So, let’s analyzed each of the point:

  • Its image is indeed erect (or upright).
  • Yes, its image has a large field of view because it forms a diminished image, a magnified image would have limited its field of view.
  • The focal length does not matter for a convex mirror, it will always form the same kind of image.
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Now for the right answer to the above question:

  1. A is not the right answer. III isn’t true.
  2. B is correct.
  3. C is incorrect. III isn’t true.
  4. D is incorrect. III isn’t true.
  5. I and II are correct.

KEY-POINTS…

You may please note this/these:

  • Large field of view simply means large coverage.
  • Diminished image would give room for wider coverage.
  • The nature of images formed by a convex mirror is the same irrespective of its focal length.

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/ culled from 2020 JAMB-UTME physics past question 21 /

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