Question

(a) Define (i) principal focus of a concave mirror, and (ii) focal length of a concave mirror.
(b) Draw diagram to represent the action of a concave mirror on a beam of parallel light rays. Mark on this diagram principal axis, focus F, centre of curvature C, pole P and focal length f, of the concave mirror.

Answer 1

Explanation:

(a) (i) The Principal focus of a concave mirror – This is the point that is parallel to the principal axis, where the incident rays converge after reflecting from the mirror. This point is indicated as F as shown in the below figure.

(ii) The Focal length of a concave mirror – This is the distance between the principal focus and its pole. This is indicated by the point f as shown in the below image.

(b) The action of a concave mirror on a beam of parallel light rays is shown in the below figure.

You can get all the answers of Chapter 4 in the link below:

https://brainly.in/question/14963178

Few questions related to this chapter:

A communications satellite in orbit sends a parallel beam of signals down t.....

brainly.in/question/14916041

When a spherical mirror is held towards the sun and its sharp image is form.....

brainly.in/question/14916032

Answer 2

━━━━━━━━━━━━━━━━━━━━━━━━━

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

━━━━━━━━━━━━━━━━━━━━━━━━━

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

DEFINE THE FOLLOWING TERMS IN RELATION TO SPHERICAL MIRRORS

• PRINCIPAL AXIS
• FOCAL LENGTH
• PRINCIPAL FOCUS
• CENTER OF CURVATURE
• RADIUS OF CURVATURE

━━━━━━━━━━━━━━━━━━━━━━━━━

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

★ 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

━━━━━━━━━━━━━━━━━━━━━━━━━

$\bf\Large\red{ THANKS \: FOR \: YOUR}$

$\bf\Large\red{ QUESTION \: HOPE \: IT }$

$\bf\Large\red{ HELPS }$

$\Large\mathcal\green{FOLLOW \: ME}$

━━━━━━━━━━━━━━━━━━━━━━━━━