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## Nootan Reflection of Light Spherical Mirrors Solutions ISC Class-12 Physics Nageen Prakashan

 Class: 12 Subject: Physics Chapter 14: Reflection of Light Spherical Mirrors
 Board ISC Writer /Publications Nootan / Nageen Prakashan/Kumar and Mittal Topics Solved Numericals Page 632

### Nootan Reflection of Light Spherical Mirrors Solutions ISC Class-12 Physics Nageen Prakashan

#### Spherical Mirror :

Suppose you are sitting at the dining table and you don’t like the food, you start playing with the spoon. You look yourself in the spoon and you notice that you look pretty funny. The moment you get the spoon closer you get a magnified image and when taken far, you see an inverted image.

Do you know what’s really happening? To understand what is happening lets us talk about the special class of mirrors known as spherical mirrors. Let us first understand the terms of spherical mirrors.

• The radius of Curvature (c): It is the distance between Pole and the Center of curvature.
• Center of Curvature (r):  The Center of Curvature of a spherical mirror is the point in the center of the mirror which passes through the curve of the mirror and has the same tangent and curvature at that point.
• Principal axis: An imaginary line passing through the optical center and the center of curvature of the spherical mirror.
• Focal Length: It is on the axis of a mirror where rays of light are parallel to the axis converge after reflection or refraction.
• Aperture: It is a point from which the reflection of light actually happens.
• Pole (p): Pole is the midpoint of a mirror. It’s twice the focus.
• Focus: It is any point, where light rays parallel to the principal axis, will converge after reflecting from the mirror.

#### Spherical mirrors are of two types :

• Convex Mirror
• Concave Mirror

Convex mirror :

The convex mirror has a reflective surface that curves outward. These mirrors are “always” form virtual, erect and diminished regardless of the distance between the object and mirror.

Concave Mirror :

A concave mirror is also known as the converging mirror as in these type of mirrors light rays converge at a point after they strike and are getting reflecting back from the reflecting surface of the mirror.

#### Reflection of Light :

Any polished or shiny surface like that of an water can act as a mirror. When a ray of light falls on such smooth or shiny object light from the object bounces back those rays of light to our eyes and this phenomenon is Reflection of Light.

Laws of Reflection :

•  The angle of incidence is equal to the angle of reflection.
• The incident ray, the normal and the reflected ray, all lie in the same plane.
• The reflected ray and the incident ray are on the opposite sides of the normal.

#### Types of Reflection :

• Diffused Reflection
• Regular Reflection

Diffused Reflection :

This is a non-mirror-like reflection of light. In this type of reflection rays of light hit an irregular object with a rough surface, and reflects back in all directions. Here, the incident ray which is reflected along with reflected ray doesn’t have the same angle to the normal as the incident ray.

Regular Reflection :

It is a mirror-like reflection of rays of light. Here the rays of light which are reflected from a smooth and shiny object such as a mirror, are reflected at a definitive angle and each incident ray which is reflected along with the reflected ray has the same angle to the normal as the incident ray.

### Chapter 14

Nootan Reflection of Light Spherical Mirrors Solutions ISC Class-12 Physics Nageen Prakashan

Page 632

—: End of Reflection of Light Spherical Mirrors Numericals :–

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