Considering only two rays is more convenient for the clarity of the ray diagram. While an infinite number of rays could originate from each small portion of the extended object, choosing two specific rays simplifies the construction of the diagram. ...

The relationship R = 2f means that the principal focus of a spherical mirror is located midway between the pole and the center of curvature. This geometric relationship simplifies the understanding of the mirror’s optical properties, particularly for mirrors with ...

Spherical mirrors with small apertures, the radius of curvature (R) is found to be equal to twice the focal length (f). Mathematically, this relationship is expressed as R = 2f. This implies that the principal focus of a spherical mirror ...

The aperture of a spherical mirror is the diameter of its reflecting surface, which has a circular outline. The aperture is the distance represented by MN in the figure. The reflecting surface is, by and large, spherical in shape.

The distance of the image from the mirror provides an approximate value for the focal length of the concave mirror. This distance represents the point where sunlight is effectively concentrated, leading to the ignition of the paper.

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 ...