The mirror is responsible for concentrating sunlight. The bright spot on the paper is the image of the Sun formed at the focus of the concave mirror.

The paper starts to burn because the concave mirror converges sunlight at a sharp, bright spot on the paper, essentially creating an image of the Sun. This focused sunlight generates enough heat to ignite the paper.

When a ray is incident obliquely towards a point P (pole of the mirror) on a concave mirror, both the incident and reflected rays follow the laws of reflection at the point of incidence. This means that the angles of ...

The incident and reflected rays follow the laws of reflection at the point of incidence (point P) on the concave mirror, making equal angles with the principal axis. This adherence to the laws of reflection ensures that the angle of ...

The light rays come back along the same path because the incident rays fall on the mirror along the normal to the reflecting surface. This adherence to the normal during incidence ensures that the angle of reflection is equal to ...