ICSE PHYSICS Class 9 Chapter 7 Reflection Of Light (ONE SHOT-FULL CHAPTER)
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Reflection of Light: Reflection of Light
Light is the form of enegrgy that causes sensation of vision. Examples to show that light travels in a straight line are light emitted by a torch light and light emitted from the headlights of a vehicle. The direction of light changes by reflection, refleraction.
As long as the medium is same,light travels in a striaght line path.
Light is the form of enegrgy that causes sensation of vision. Examples to show that light travels in a straight line are light emitted by a torch light and light emitted from the headlights of a vehicle. The direction of light changes by reflection, refleraction.
Reflection of Light
The bouncing back of light into the same medium after striking a surface is called relection of light. This happens when light is incident on a translucent or an opaque medium. When light is incident on a transparent medium, all the incident light passes through the medium, and reflection does not take place. In the case of translucent medium, a part of the incident light is reflected, and the rest is transmitted through the medium.
We get light from a luminous object, which we refer to as a source of light. If the size of the source of light is very small, then we call it a point source of light. If the size of the source of light is considerable, then we say it is an extended source of light. Light rays from a point source of light travel in all directions, moving away with time. Such a beam of light is called a divergent beam of light.
If the light source is an extended source, then we get a parallel beam of light from it. Consider a parallel beam of light from an extended source, incident on a plane surface like a plane mirror. As the beam of light is parallel, and the surface on which the beam is incident is a plane surface, the angle made by each ray with the normal at the point of incidence on the surface is equal, which implies that the angle of incidence of all the rays is equal.
when light strikes smooth and highly polished surfaces,it bounces back into the same medium.This is called reflection of light
Types of Reflection
There are two types of reflections:
1.Regular reflection
2.Irregular reflection
Regular Reflection
Regular reflection occurs when a beam of light falls on a very smooth surface like a plane mirror the light rays fall at different points on the smooth surface and each ray gets reflected from it obeying the laws of relection of light. Due to the even surface, from different points, light rays get reflected in same directions and give rise to the regualar reflection of light.
Light is the form of enegrgy that causes sensation of vision. Examples to show that light travels in a straight line are light emitted by a torch light and light emitted from the headlights of a vehicle. The direction of light changes by reflection, refleraction.
Reflection of Light
The bouncing back of light into the same medium after striking a surface is called relection of light. This happens when light is incident on a translucent or an opaque medium. When light is incident on a transparent medium, all the incident light passes through the medium, and reflection does not take place. In the case of translucent medium, a part of the incident light is reflected, and the rest is transmitted through the medium.
Irregular Reflection
Irregular reflection occurs when a beam of light falls on a rough surface like the wall of a room or the surface of a wooden table. Although they appear to be very smooth,they are actually uneven, having many small projections over them.
Incident Ray
The light ray striking a reflecting surfaces is called the incident ray.
Point of Incidence
The point at which the incident ray strikes the reflecting surface, is called the point of incidence.
Reflected ray
The light ray obtained after reflection from the surface, in the same medium in which the incident ray is travelling, is called reflected ray.
Angle of Incidence
The angle which the incident ray makes with normal at the point of incidence, is called the angle of incidence. It is denoted by the letter i.
Angle of Reflection
The angle which the reflected ray makes with the normal at the point of incidence, is called the angle of reflection. It is denoted by the letter r.
Reflection of Light: Reflection of Light
Light is the form of enegrgy that causes sensation of vision. Examples to show that light travels in a straight line are light emitted by a torch light and light emitted from the headlights of a vehicle. The direction of light changes by reflection, refleraction.
As long as the medium is same,light travels in a striaght line path.
Light is the form of enegrgy that causes sensation of vision. Examples to show that light travels in a straight line are light emitted by a torch light and light emitted from the headlights of a vehicle. The direction of light changes by reflection, refleraction.
Reflection of Light
The bouncing back of light into the same medium after striking a surface is called relection of light. This happens when light is incident on a translucent or an opaque medium. When light is incident on a transparent medium, all the incident light passes through the medium, and reflection does not take place. In the case of translucent medium, a part of the incident light is reflected, and the rest is transmitted through the medium.
We get light from a luminous object, which we refer to as a source of light. If the size of the source of light is very small, then we call it a point source of light. If the size of the source of light is considerable, then we say it is an extended source of light. Light rays from a point source of light travel in all directions, moving away with time. Such a beam of light is called a divergent beam of light.
If the light source is an extended source, then we get a parallel beam of light from it. Consider a parallel beam of light from an extended source, incident on a plane surface like a plane mirror. As the beam of light is parallel, and the surface on which the beam is incident is a plane surface, the angle made by each ray with the normal at the point of incidence on the surface is equal, which implies that the angle of incidence of all the rays is equal.
when light strikes smooth and highly polished surfaces,it bounces back into the same medium.This is called reflection of light
Types of Reflection
There are two types of reflections:
1.Regular reflection
2.Irregular reflection
Regular Reflection
Regular reflection occurs when a beam of light falls on a very smooth surface like a plane mirror the light rays fall at different points on the smooth surface and each ray gets reflected from it obeying the laws of relection of light. Due to the even surface, from different points, light rays get reflected in same directions and give rise to the regualar reflection of light.
Light is the form of enegrgy that causes sensation of vision. Examples to show that light travels in a straight line are light emitted by a torch light and light emitted from the headlights of a vehicle. The direction of light changes by reflection, refleraction.
Reflection of Light
The bouncing back of light into the same medium after striking a surface is called relection of light. This happens when light is incident on a translucent or an opaque medium. When light is incident on a transparent medium, all the incident light passes through the medium, and reflection does not take place. In the case of translucent medium, a part of the incident light is reflected, and the rest is transmitted through the medium.
Irregular Reflection
Irregular reflection occurs when a beam of light falls on a rough surface like the wall of a room or the surface of a wooden table. Although they appear to be very smooth,they are actually uneven, having many small projections over them.
Incident Ray
The light ray striking a reflecting surfaces is called the incident ray.
Point of Incidence
The point at which the incident ray strikes the reflecting surface, is called the point of incidence.
Reflected ray
The light ray obtained after reflection from the surface, in the same medium in which the incident ray is travelling, is called reflected ray.
Angle of Incidence
The angle which the incident ray makes with normal at the point of incidence, is called the angle of incidence. It is denoted by the letter i.
Angle of Reflection
The angle which the reflected ray makes with the normal at the point of incidence, is called the angle of reflection. It is denoted by the letter r.
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