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A convex mirror is used as a driving mirror because…

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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

QUICK ANSWER…

B

DETAILS…

Convex mirrors are often used as drivers mirrors because they form virtual, upright (erect), and diminished images making it possible to view a larger field behind the vehicle.

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So,

  • I is correct, its image is erect
  • II is correct, its images are diminished, offering a wider field of view.
  • III is wrong, the focal length of convex mirrors does not matter.

Now for the right answer to the above question:

  1. Option A is incorrect. III is wrong
  2. Option B is correct.
  3. C is incorrect. I is correct, III is wrong
  4. D is not the correct answer. III is wrong

KEY-POINTS…

You may please note these/this:

  • Images formed by convex mirrors are usually erect, virtual, and diminished irrespective of the position of the object.

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/ culled from 2017 JAMB-UTME physics question 32 /

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