Question

Define
A) Center of curvature
B) Focus point
C) focal length
D) Radius of curvature
E) Pole
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Answer 1

Answer:

A) The center of sphere whose parts from surface of the lenses are called center of curvature.

B) The focus is the point on the principal axis of a lens where all incident parallel rays, after refraction from the lens meet or appear to diverge from for lenses there are foci (f1 and f2) depending on the direction of incident rays.

C) The distance between the focus (f1 or f2) and the optical center (O) is known as the focal length of the lens.

D) The distance of the optical centre from either either of the center of curvature is termed as the radius of curvature.

E) The centre of the spherical surface of the mirror, called the pole of the mirror.

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