Question

by using a concave mirror to get the magnification less than one the object should be placed
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Answer 1

Answer:

beyond c

the mirror must be a spherical mirror as the magnification in plane mirror never-1 but always 1. also convex mirror always produces images smaller than the size of the object so it's magnification is always less than 1. hence it is a concave mirror.

Answer 2

The object has to be placed beyond CENTRE OF CURVATURE.

• Since the question asks for a magnification less than 1 , it means that : the image has to be real, inverted and diminished.

Now, for such an image characteristics, the object has to be placed beyond the centre of curvature.

• This leads to formation of image in between the centre of curvature and the focus of the mirror.

The image which is formed is :

• Real
• Inverted
• Diminished

$\star$ Hope It Helps.