Question

define principal axis and focal length

Answer 1

Principal axis:-The line which passes through the pole and the focus is called principal axis.

Focal length:-The distance between the pole and focus is known as focal length.

Answer 2

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

DEFINE THE FOLLOWING TERMS IN RELATION TO SPHERICAL MIRRORS

PRINCIPAL AXIS

FOCAL LENGTH

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

★ PRINCIPAL AXIS ★

THE STRAIGHT LINE THAT GOES TO THE CENTRE OF THE SPHERICAL MIRROR AT RIGHT ANGLE TO THE MIRROR IS CALLED PRINCIPAL AXIS

★ FOCAL LENGTH ★

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

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