In a setup where a concave mirror is used to focus sunlight onto a sheet of paper, explain why the paper starts to burn at the focal point of the mirror. Discuss the nature of the image formed and the properties of the concave mirror that facilitate this effect.
1
The concave mirror focuses parallel rays of sunlight to a single point, increasing the light intensity and causing the paper to burn. The image formed at the focal point is real and inverted, showcasing the converging property of the concave mirror.
2
The concave mirror diverges sunlight, spreading it over a larger area and causing the paper to burn due to increased light spread.
3
The concave mirror reflects light uniformly, creating a virtual image at the focal point which causes the paper to burn due to heat concentration.
4
The concave mirror absorbs sunlight and re-emits it as heat, causing the paper to burn