someone explain me what is focal length of convex and concave mirror
Answers
Answer:
Focal length. Focal length. 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.
Answer:
hope it helps u
Explanation:
focal length of concave mirror:
To determine the focal length of a concave mirror, by obtaining image of a distant object.
A concave mirror, like a plane mirror, obeys the laws of reflection of light.
Rays of light from object - The rays of light coming from a distant object e.g. sun or a distant building can be considered to be parallel to each other. When these parallel rays of light fall on a concave mirror along its axis, reflect and meet at a point in front of the mirror, which is called as Principal focus of the mirror.
A real, inverted and very small image size is formed at the focus of the mirror.
Focal Length - The distance between the pole P of the concave mirror and the focus F is the focal length of the concave mirror. Thus, the focal length of a concave mirror can be estimated by obtaining a 'Real image' of a distant object at its focus, as shown in the figure.
focal length of convex mirror:
The focal length of a convex mirror is redefined to be minus the distance between points and . In other words, the focal length of a concave mirror, with a real focus, is always positive, and the focal length of a convex mirror, with a virtual focus, is always negative.