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what is focal length and radius of curvature of a concave lens ?

6 years ago

Focal Length and Radius of Curvature

concave mirror

convex mirror

Consider a ray of light AB, parallel to the principal axis, incident on a spherical mirror at point B. The normal to the surface at point B is CB and CP = CB = R, is the radius of curvature. The ray AB, after reflection from mirror will pass through F (concave mirror) or will appear to diverge from F (convex mirror) and obeys law of reflection, i.e., i = r.

From the geometry of the figure,

If the aperture of the mirror is small, B lies close to P, \ BF = PF

or FC = FP = PF

or PC = PF + FC = PF + PF

or R = 2 PF = 2f

Similar relation holds for convex mirror also. In deriving this relation, we have assumed that the aperture of the mirror is small.

6 years ago

the radius of a circle which touches a curve at a given point and has the same tangent and curvature at that point.

6 years ago

Focal Length:

The distance of principle focus from optic center is called focal length of aconcave lens.

Radius of Curvature:

The radius of the sphere of which the curved surface of the lens forms a part is called the radius of curvature of a concave lens. A concave lens has two radii of curvatures

6 years ago

Focal Length: The distance of principle focus from optic center is called focal length of a

concave lens.

Radius of Curvature: The radius of the sphere of which the curved surface of the lens forms

a part is called the radius of curvature of a concave lens. A concave lens has two radii of

curvatures.

concave lens.

Radius of Curvature: The radius of the sphere of which the curved surface of the lens forms

a part is called the radius of curvature of a concave lens. A concave lens has two radii of

curvatures.

6 years ago

The distance of principle focus from optic center is called focal length of a concave lens. The radius of the sphere of which the curved surface

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