A convex mirror is used as a driving mirror; however, a disadvantage in this regard is that the image

Analyze the question A convex (diverging) mirror is used as a driving mirror because it gives a wide field of view. The question asks for a disadvantage of the image it forms.

Explain the concept A convex mirror always forms an image that is:

• virtual (it appears behind the mirror)
• upright
• diminished (smaller than the object)

Because the image is diminished, objects look smaller, and so they seem farther away than they really are. This is the real drawback. A driver may misjudge the distance of vehicles behind and think they are farther than they actually are.

Check each option

• A. The image is virtual: This is true, but it is not a disadvantage. A driver only needs to see the image, and a virtual image is perfectly good for that.
• B. The image is real: This is false. A convex mirror cannot form a real image of a real object.
• C. The image is not as bright: This is not the standard disadvantage. The image brightness is not the reason given for the mirror's limitation.
• D. The image appears farther away from the driver: This is correct. The diminished image makes vehicles seem more distant than they are, which can cause misjudgment.

Answer: D.

Tip: Remember "convex = wide view, small image." Wide view is the advantage, and the small image that makes things look far away is the disadvantage. Similar questions often ask why convex mirrors are used for driving mirrors, shop security mirrors, or street corners. The answer is always the wider field of view.