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  4. An object is placed at a distance of 40 cm in front of a concave mirror of focal length 20 cm. The image produced is

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Q. An object is placed at a distance of $40\, cm$ in front of a concave mirror of focal length $20\, cm$. The image produced is

TS EAMCET 2020

Solution:

The given situation is shown below
image
As, focal length, $f=-20\, cm$
Radius of curvature, $R=2 f=-40\, cm$
This means object is at centre of curvature.
So, its image is also formed at centre of curvature which is real, inverted and of same size.