define focus of convex and concave mirror and give the relationship between focal length and radius of curvature
Answers
The principal focus of a convex mirror is a point on its principal axis from a beam of light rays initially to axis, appears to diverge after being reflected from convex mirror.
The principal focus of a concave mirror is a point on its principal axis to which all the light rays which are parallel and close to the axis converge after the reflection from concave mirror.
Focal length of a spherical mirror is equal to half of its radius of curvature
Answer:
Answer:
In Hindi
फोकस लंबाई:
★उत्तल दर्पण:
दर्पण के ध्रुव से दर्पण में समानांतर प्रकाश के बिंदु तक की दूरी को उत्तल दर्पण की फोकस दूरी कहा जाता है।
★अवतल दर्पण:
एक दर्पण जिस पर प्रकाश की समानांतर किरण उत्सर्जित होती है, ऐसा लगता है जैसे वह एक बिंदु पर एक साथ आ गया है। दर्पण के ध्रुव से उस बिंदु तक की दूरी अवतल दर्पण की फोकस दूरी कहलाती है।
फोकस दूरी और वक्रता त्रिज्या के बीच संबंध f=r/2 है।
In English:
Focus Length:
★Convex Mirror:
The distance from the pole of a mirror to a point of parallel light in a mirror is called the focal length of the convex mirror.
★ Concave Mirror:
A mirror on which a parallel ray of light is emitted, looks as if it has come together at a point. The distance from the pole of the mirror to that point is called the focal length of the concave mirror.
The relationship between focal length and radius of curvature is f=r/2.