मराठी
CISCE(English Medium) ICSE Class 9
प्रश्नपत्रिका१०
पाठ्यपुस्तक उत्तरे२१३२५
संकल्पना स्पष्टीकरण आणि व्हिडिओ३३४
अभ्यासक्रम

Spherical Mirrors

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Topics

  • Definition: Spherical Mirror
  • Definition: Concave Mirror
  • Definition: Convex Mirror
  • Definition: Pole
  • Definition: Centre of Curvature
  • Definition: Radius of Curvature
  • Definition: Principal Axis
  • Introduction
  • Types of Spherical Mirrors
  • Activity
  • Key Points: Spherical Mirrors
Maharashtra State Board: Class 9

Introduction:

Spherical mirrors are curved mirrors that form images different from those formed by plane mirrors. Unlike the flat mirrors commonly used at home, spherical mirrors distort images depending on their shape. For example, mirrors in a laughing chamber create distorted reflections due to their curved surfaces.

Laughing Chamber

These mirrors are also used in practical applications, such as rearview mirrors in cars, which allow drivers to see vehicles approaching from behind. The unique properties of spherical mirrors make them useful in various scientific, entertainment, and safety applications.

CBSE: Class 10
CISCE: Class 12

Definition: Spherical Mirrors

Mirrors whose reflecting surfaces are spherical are called spherical mirrors.

OR

A spherical mirror is a part of a hollow sphere, whose one side is silvered and coated with red oxide and the other side is the reflecting surface.

CBSE: Class 10
CISCE: Class 12

Definition: Concave Mirror

A spherical mirror, whose reflecting surface is curved inwards, that is, faces towards the centre of the sphere, is called a concave mirror.

OR

A concave mirror is one whose reflecting surface is towards the centre of the sphere of which the mirror is a part.

CBSE: Class 10
CISCE: Class 12

Definition: Convex Mirror

A spherical mirror whose reflecting surface is curved outwards, is called a convex mirror.

OR

A convex mirror is one whose reflecting surface is away from the centre of the sphere of which the mirror is a part.

CBSE: Class 10
CISCE: Class 12

Definition: Pole

The centre of the reflecting surface of a spherical mirror is a point called the pole. The pole is usually represented by the letter P.

OR

The central point of the reflecting surface of the mirror is called the 'pole' of the mirror.

CBSE: Class 10
CISCE: Class 12

Definition: Centre of Curvature

The reflecting surface of a spherical mirror forms a part of a sphere. This sphere has a centre. This point is called the centre of curvature of the spherical mirror. It is represented by the letter C.

OR

The centre of the sphere of which the mirror forms a part, is called the ‘centre of curvature' of the mirror.

CBSE: Class 10
CISCE: Class 12

Definition: Radius of Curvature

The radius of the sphere of which the reflecting surface of a spherical mirror forms a part is called the radius of curvature of the mirror. It is represented by the letter R.

OR

The radius of the sphere of which the mirror forms a part, is called the 'radius of curvature' of the mirror.

CBSE: Class 10
CISCE: Class 12

Definition: Principal Axis

A straight line passing through the pole and the centre of curvature of a spherical mirror. This line is called the principal axis.

OR

The straight line joining the pole and the centre of curvature of the mirror and extended on both sides is called the 'principal axis' of the mirror.

Maharashtra State Board: Class 9

Activity

Formation and Reflection in Spherical Mirrors:

  • Cut a rubber ball into two equal halves and observe the curved surfaces.
  • The inner surface is concave, resembling a concave mirror, where light reflects inside the curve.
  • The outer surface is convex, resembling a convex mirror, where light reflects outward.
  • In real spherical mirrors, either the inner or outer surface of a hollow glass sphere is coated with a reflective material like silver or aluminium.
  • Concave mirrors focus light and are used in headlights and magnifying mirrors, while convex mirrors spread light and are used in vehicle side mirrors and security mirrors.
  • This activity demonstrates how spherical mirrors are formed and how light reflects differently depending on the curved surface.

Creation of spherical mirrors

CBSE: Class 10

Key Points: Spherical Mirrors

  • A concave mirror has an inward-curved reflecting surface, while a convex mirror has an outward-curved reflecting surface.
  • Important parts of a spherical mirror: Pole (P), Centre of Curvature (C), Principal Axis, and Principal Focus (F).
  • For spherical mirrors, the relation is R = 2f, where R is the radius of curvature and f is the focal length.
  • In concave mirrors, parallel rays converge at the focus; in convex mirrors, they appear to diverge from the focus behind the mirror.

Shaalaa.com | Light Reflection and Refraction part 3 (Spherical Mirror)

Shaalaa.com


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Light Reflection and Refraction part 3 (Spherical Mirror) [00:12:08]
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Light Reflection and Refraction part 3 (Spherical Mirror)
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Light Reflection and Refraction part 4 (Focal Length of Spherical Mirror)
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Light Reflection and Refraction part 5 (Image formation Spherical Mirror)
00:08:26  undefined
Light Reflection and Refraction part 8 (Spherical Mirror Application)
00:04:05  undefined

Related QuestionsVIEW ALL [278]

Find the height of the image of a body of height 1.5m in a mirror with a magnification of 1.5.

Write the sign convection used in optics.

Complete the following diagrams in Figure by drawing the reflected rays for the incident rays 1 and 2.

Does the mirror mentioned in part (b) form real image for all locations of the object? 

Name the two types of spherical mirrors. What type of mirror is represented by the: 

front side of a shining steel spoon?

A student obtains a sharp image of the distant window (W) of the school laboratory on the screen (S) using the given concave mirror (M) to determine its focal length. Which of the following distances should he measure to get the focal length of the mirror?

When we look into a plane mirror, is the image of our face real or virtual?

State two uses of a concave mirror. 

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