The parallel rays of light from the sun are focussed at a point using a concave mirror which is used to burn paper from the above diagram.
In the concave mirror, as we bring the object closer, the image gets bigger.
An Erected Magnified image is seen.
At some positions, there is no image that is obtained from the concave mirror.
There the conclusion is Concave is more complicated than the plane mirror.
Laws for the creation of Image made by Spherical Mirrors
When the position of the object is at infinity, the position of the image is at the principal focus. The size of the image is point size and the nature of the image is real and inverted.
The position of the object is beyond the centre of curvature C where the position of the image formed is between F and C. The size of the image is smaller than the object and the nature of the image is real and inverted.
The position of the object is at the centre of curvature C then the position of the image is at C. The size is the same and the position of the image is real and inverted.
The position of the object is between C and F, then the position of the image is beyond C, the size of the image is Magnified and the nature of the image is real and inverted.
The position of the object is at the principal focus F, then the image is formed at infinity. The size of the image is Infinitely large and the nature of the image is real and inverted.
The position of the object is between the principal focus F and the pole P of the mirror. Then the image is formed behind the mirror. The size of the image is Magnified and the nature of the image is Virtual and Erect.
