Question

define focal length with diagram​

Answer 1

Answer:

Definition:

Focal length 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.

Diagram is attached....

Answer 2

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$\Large\fbox{\color{purple}{CORRECT \: QUESTION}}$

DEFINE THE FOLLOWING TERMS IN RELATION TO SPHERICAL MIRRORS

FOCAL LENGTH

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$\Large\fbox{\color{purple}{ SOLUTION }}$

★ FOCAL LENGTH ★

IT IS THE DISTANCE ON PRINCIPAL AXIS FROM PRINCIPAL FOCUS TO THE POLES OF SPHERICAL MIRROR

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