Reflection of Light
• Light is a form of energy which gives us the sensation of vision.
• Light travels in a straight line. The return of light after striking a surface is called reflection of light.
• A highly polished and smooth surface, such as a plane mirror, reflects almost the entire light incident on it.
• A plane mirror is made by silvering one side of a plane glass plate.
• The reflection of light obeys two laws of reflection:
- The angle of incidence is equal to the angle of reflection.
- The incident ray, reflected ray and normal all lie in same plane.
• Real image is an image which can be obtained on screen.
• Virtual image is an image which cannot be obtained on a screen.
• A plane mirror forms the image by reflection of light.
• The image formed by a plane mirror has the following characteristics:
- The image is virtual
- The image is upright
- The image is as far behind the mirror as the object is in front of it.
- The image is of the same size as that of the object.
- The image is laterally inverted.
• Lateral inversion is the phenomenon in which left and right sides in the object and its image interchanges.
• The reflection of light from a smooth and polished surface like a plane mirror is called regular reflection.
• The reflection of light from a rough surface such as a wall is known as irregular or diffused reflection.
• We are able to see the object around us due to diffused reflection of light from them in all the directions.
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Due to reflection from the mirror, the direction of lightMarks:1
When light falls on the mirror, it changes its direction in the same medium which is called reflection of light. The direction of the reflected ray depends on the angle of incidence.
Periscopes make use ofMarks:1
Periscopes make use of two plane mirrors to see the objects on the surface of sea which are not visible directly from submarine.
A polished or a shiny surface can act as aMarks:1
Mirror is a polished or a shiny surface through which regular reflection can take place.
In a plane mirror, only the sides of an object change but the image appears to beMarks:1
In a plane mirror, only the sides of an object change but the image appears erect, as the image formed is virtual.
An object on left appears at right in a plane mirror and vice versa. This phenomena is known asMarks:1
Lateral inversion is the phenomena in which the left side of an object appears to be the right side of the image and the right side of an object appears to be the left side of the image in a plane mirror. Hence, the image is sideways inverted.