Question

The focal point is denoted by the letter a)& b)f c)d d)D​

Answer 1

Answer:

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Midway between the vertex and the center of curvature is a point known as the focal point; the focal point is denoted by the letter F in the diagram. The distance from the vertex to the center of curvature is known as the radius of curvature (abbreviated by "R").

Answer 2

Answer:

Correct answer is

Capital F =Focus(focal point)

Small f = focal length

For Proof :-»

Check pictures