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Q.

The point where light rays that are parallel to the principal axis converge (in the case of a convex lens) or appear to diverge from (in the case of a concave lens) after passing through the lens is known as ________________________.

Convex & Concave Lenses - Pass My Exams: Easy exam revision notes for GSCE  Physics<

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a

Focal point

b

Pole

c

Radius of curvature

d

Focal length

answer is A.

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Detailed Solution

  • The focal point of a lens is the point where light rays that are parallel to the principal axis converge (in the case of a convex lens) or appear to diverge from (in the case of a concave lens) after passing through the lens. 
  • The focal point is located on the principal axis and is a fixed distance from the lens, which depends on the shape of the lens and its refractive properties.
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