A convex mirror has a focal length of 20 cm. If an object is placed 40 cm from the mirror, what will be the nature and relative size of the image?
Virtual, smaller than the object
A convex mirror always forms a virtual, erect image located behind the mirror, regardless of the position of the object in front of it.
As the object distance increases, the image formed by a convex mirror becomes smaller and moves closer to the focus, but it always remains virtual and diminished, never real.
With the object at 40 cm from a convex mirror of focal length 20 cm, the image formed is virtual and smaller in size than the object.
Hence, the correct answer is virtual, smaller than the object.
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