Lambapind Light
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Light Presented by : Pooja,mandeep,anita,ravina, kuldeep class 7th
SOURCES OF LIGHT Light makes things visible. In the daytime , we see things due to the light from the sun. At night ,we use electric light, a torch or a candle. An object which emits light,is called a sources of light.The shadow is shorter and in the evening, the shadow is again bigger.
Classification of source of light Natural The source which emit light of there own are called the natural source of light .
Man-made During the day .the sun light helps us to see the object around us,what of night are use candle, to such light ,electric bulb etc.
Light travels in a straight line Many phenomenon occurring around us suggest that light travels in a straight line. you might have observed sunlight entering from a small slit in a door . The sun rays appear to be traveling in a straight line. light travels in a straight line can also be shown by the following activity.
When light or a ray of light falls on an object, three things can happen……………… categories 1. Transparent :- materials, such as air……… 2. Translucent :- materials , such as butter paper… 3. Opaque:- materials, such as word, coal… ……
shadow The shadow is the dark region that
an object causes when it prevents light from falling on surface behind it. to observe the size of the shadow ,an activity can be performed.
Eclipses This formation of shadow cast by a heavenly body over the other is called an eclipse. Eclipses are of two types:3) Solar Eclipse 4) Lunar Eclipse
Solar Eclipse When
the moon comes in between the sun and the earth , the shadow of the moon forms on the earth resulting in the solar eclipse.
Lunar Eclipse Lunar
Eclipse Occurs when the earth comes between the sun and the moon and the shadow of the earth forms on the moon
Reflection Whenever a ray of light reaches a surface between two different mediums such as glass etc.Then following things can happen. 1.Light may pass through the surface. 2.Light may bounce back in the same medium in which it was travelling before reaching the surface. 3.Light may be absorbed by the surface. The bouncing back of light into the same medium is called reflection of light.The surface from which light reface are called reflecting surface.
Types of reflection Diffused reflection :- The reflecting surface can be rough or smooth . If the light reflects from a rough surface. This is called diffused reflection Regular reflection:- If the reflecting surface is smooth i.e. polished , it sends the light in a particular direction after the reflection. Such a reflection is called regular reflection and the reflecting surface is called the mirror.
Formation of image by a plane mirror When we stand in front of a plan mirror, an image of the same size can be observed behind the mirror. To understand how image forms behind the mirror , consider a small object O placed in front of mirror MM’ as shown in figure.
Formation of images by concave mirror We
can obtain the position of the image of an object when at least two of reflected rays are obtained and the point of intersection of these reflected rays is the postion of the image.We make use of following rules for the image formation.
When ray of light passes through the centre
A ray of light passing through the centre of curvature of the concave mirror reflected back along the same path.
When ray of light passes through the centre
A ray of light which passes through the focus of the concave mirror becomes parallel to the principal axis after reflection.
When ray of light travels parallel to the principal axis
A ray which travels parallel to the principal axis of the concave mirror passes through the focus after reflection from the mirror.
Uses of mirrors The plane mirrors are used in the barber’s shops and in homes as a looking glass. Mirrors are used in peroscope. A concave mirror is used as a shaving mirror. It is used as reflector in a search light for a car head light. It is used in the solar cookers to converge the radiations from the sun. A convex mirror is used in the cars and other vehicles as a rear view mirror to look at the vehicles behind us.
Sphecical mirrors:-The pherical mirrors are of two types Concave
mirrors Convex mirrors
Concave mirrors
A concave mirror is that spherical mirror in which the reflection of light takes place at the bent-in show in figure in which the reflecting surface has been marked as A and the other surface as B .the inner shining surface of spoon acts as a concave mirror .
Convex mirrors A convex mirror is that spherical mirror in which the reflection of light takes place at the bulged-in show in figure in which the reflecting surface has been marked as A and the other surface as B .the outer shining surface of spoon acts as a convex mirror .
SOURCES OF LIGHT Light makes things visible. In the daytime , we see things due to the light from the sun. At night ,we use electric light, a torch or a candle. An object which emits light,is called a sources of light.The shadow is shorter and in the evening, the shadow is again bigger.
Classification of source of light Natural The source which emit light of there own are called the natural source of light .
Man-made During the day .the sun light helps us to see the object around us,what of night are use candle, to such light ,electric bulb etc.
Light travels in a straight line Many phenomenon occurring around us suggest that light travels in a straight line. you might have observed sunlight entering from a small slit in a door . The sun rays appear to be traveling in a straight line. light travels in a straight line can also be shown by the following activity.
When light or a ray of light falls on an object, three things can happen……………… categories 1. Transparent :- materials, such as air……… 2. Translucent :- materials , such as butter paper… 3. Opaque:- materials, such as word, coal… ……
shadow The shadow is the dark region that
an object causes when it prevents light from falling on surface behind it. to observe the size of the shadow ,an activity can be performed.
Eclipses This formation of shadow cast by a heavenly body over the other is called an eclipse. Eclipses are of two types:3) Solar Eclipse 4) Lunar Eclipse
Solar Eclipse When
the moon comes in between the sun and the earth , the shadow of the moon forms on the earth resulting in the solar eclipse.
Lunar Eclipse Lunar
Eclipse Occurs when the earth comes between the sun and the moon and the shadow of the earth forms on the moon
Reflection Whenever a ray of light reaches a surface between two different mediums such as glass etc.Then following things can happen. 1.Light may pass through the surface. 2.Light may bounce back in the same medium in which it was travelling before reaching the surface. 3.Light may be absorbed by the surface. The bouncing back of light into the same medium is called reflection of light.The surface from which light reface are called reflecting surface.
Types of reflection Diffused reflection :- The reflecting surface can be rough or smooth . If the light reflects from a rough surface. This is called diffused reflection Regular reflection:- If the reflecting surface is smooth i.e. polished , it sends the light in a particular direction after the reflection. Such a reflection is called regular reflection and the reflecting surface is called the mirror.
Formation of image by a plane mirror When we stand in front of a plan mirror, an image of the same size can be observed behind the mirror. To understand how image forms behind the mirror , consider a small object O placed in front of mirror MM’ as shown in figure.
Formation of images by concave mirror We
can obtain the position of the image of an object when at least two of reflected rays are obtained and the point of intersection of these reflected rays is the postion of the image.We make use of following rules for the image formation.
When ray of light passes through the centre
A ray of light passing through the centre of curvature of the concave mirror reflected back along the same path.
When ray of light passes through the centre
A ray of light which passes through the focus of the concave mirror becomes parallel to the principal axis after reflection.
When ray of light travels parallel to the principal axis
A ray which travels parallel to the principal axis of the concave mirror passes through the focus after reflection from the mirror.
Uses of mirrors The plane mirrors are used in the barber’s shops and in homes as a looking glass. Mirrors are used in peroscope. A concave mirror is used as a shaving mirror. It is used as reflector in a search light for a car head light. It is used in the solar cookers to converge the radiations from the sun. A convex mirror is used in the cars and other vehicles as a rear view mirror to look at the vehicles behind us.
Sphecical mirrors:-The pherical mirrors are of two types Concave
mirrors Convex mirrors
Concave mirrors
A concave mirror is that spherical mirror in which the reflection of light takes place at the bent-in show in figure in which the reflecting surface has been marked as A and the other surface as B .the inner shining surface of spoon acts as a concave mirror .
Convex mirrors A convex mirror is that spherical mirror in which the reflection of light takes place at the bulged-in show in figure in which the reflecting surface has been marked as A and the other surface as B .the outer shining surface of spoon acts as a convex mirror .
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