Question

answer please class 10 ​

Answer 1

Light rays that are parallel to the principal axis of a concave mirror converge at a specific point on its principal axis after reflecting from the mirror. This point is known as the principal focus of the concave mirror.

The light rays that converge on the principal axis after reflecting from a convex mirror and are parallel to the principal axis are called principal focus of a convex mirror. They either actually in real meets or appears virtually to meet.

the distance between the centre of a lens or curved mirror and its focus.

The distance between the pole of the concave mirror and the focus is known as the focal length of the concave mirror. The focal length of a concave mirror can be estimated by obtaining a real image of the distant object.

Focal length (shown in red) is the distance between the center of a convex lens or a concave mirror and the focal point of the lens or mirror — the point where parallel rays of light meet, or converge.