Question

Define 1-aperture , 2-pole , 3-principal axis , 4-radius of curvature , 5-focal length.

Answer 1

• Aperture

→ The effective diameter of the circular outline of a spherical lens is called its aperture. It is that part of the reflecting surface of a mirror which is exposed to the incident light. It is equal to the straight line distance between two ends of the mirror.

• Pole

→ Pole of the spherical mirror is the mid - point of its reflecting surface. It is shown by P.

• Principal Axis

→ The principal axis of a spherical mirror is the line joining the Pole and centre of curvature. It is represented by F.

• Radius of Curvature

→ Radius of Curvature of a spherical mirror is the radius of imaginary sphere of which, mirror is a part. It is mostly shown by R.

• Focal Length

→ The distance between pole and principal focus of a spherical mirror is called its focal length. It is represented by [ f ].

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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