Question

definition of principle axis, centre of curvature,radius of curvature,focus of concave mirror,focus of convex mirror,focal length​

Answer 1

Answer:

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Principal axis:- It is a straight line joining the central point P (called pole) and geometrical centre to hollow sphere of which mirror is a part (called centre of curvature )

Centre of curvature:- The centre of curvature of a spherical mirror is the centre of the hollow sphere of glass of which the mirror is a part

Focus of cancave mirror:- It is a point F on the principal axis where a beam of light , coming parallel to the principal axis meet after reflection.

Focus of convex mirror:- A number of rays parallel to principal axis when reflected appear to meet at a point on principal axis the point is known as principal focus of convex mirror.

Focal length :- Distance between pole P and focus F is called focal length.

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Answer 2

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$\bf\Huge\red{\mid{\overline{\underline{ ANSWER }}}\mid }$

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

DEFINE THE FOLLOWING TERMS IN RELATION TO SPHERICAL MIRRORS

PRINCIPAL AXIS

FOCAL LENGTH

PRINCIPAL FOCUS

CENTER OF CURVATURE

RADIUS OF CURVATURE

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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

★ PRINCIPAL FOCUS ★

IT IS A POINT ON PRINCIPAL AXIS WHERE ALL REFLECTED RAYS ARE EITHER CONVERGE OR DIVERGE

★ CENTER OF CURVATURE ★

IT IS THE CENTRE OF THE SPHERE WHICH MIRROR IS A PART

★ RADIUS OF CURVATURE ★

IT IS A DISTANCE ON PRINCIPAL AXIS FROM CENTRE OF CURVATURE TO THE POLES OF SPHERICAL MIRROR

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