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Define focal length?

Define focal length?

Grade:12

8 Answers

venky
235 Points
6 years ago
the distance between the centre of a lens or curved mirror and its focus.
  • the equivalent distance in a compound lens or telescope.
HARI OBULESU
33 Points
6 years ago
the distance between center to the pole is called focal length
PRAPULPODISHETTI
669 Points
6 years ago
A mirror which is a part of a sphere is called Sherical Mirror.
SHANMUKESHWAR
461 Points
6 years ago
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.
chandu
30 Points
6 years ago
The focal length of an optical system is a measure of how strongly the system converges or diverges light.
siva prasad reddy
45 Points
5 years ago
A mirror which is a part of a sphere is called Sherical Mirror.or 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.
pavan picheri
38 Points
5 years ago
The focal length of the lens is the distance between the lens and the image sensor when the subject is in focus, usually stated in millimeters (e.g., 28 mm, 50 mm, or 100 mm). In the case of zoom lenses, both the minimum and maximum focal lengths are stated, for example 18–55 mm.
 
E.Nandhini ketha
115 Points
3 years ago
the distance between the centre of a lens or curved mirror and its focus. (or) the equivalent distance in a compound lens or telescope.

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