Let us hold a concave mirror in our hand and direct its reflecting surface towards the sun. Direct the light reflected by the mirror on to a sheet of paper held close to the mirror. Move the sheet back and forth till we find a bright, sharp spot of light on the paper sheet. Hold on the mirror and the paper in the same position for some time. We observe that the paper at first begins to burn producing smoke and eventually it may even catch fire. This activity shows the converging action of concave mirror. The heat produced due to the concentration of sunlight ignites the paper.
Draw a ray diagram to show converging action of a concave mirror.

Explanation

Ray diagram is shown here.