Question

define focus of convex and concave mirror and give the relationship between focal length and radius of curvature​

Answer 1

Answer: the focus  is a pint in which all the rays meet in concave mirror in a convex mirror the focus is a point in which where all the rays appears to be coming from  the radius of  curvature is the double of focal length which is denoted by small letter f .the focus is denoted by capital F

this relation ship  can be represented  as

R= 2f

or f=1/2R

Answer 2

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.