koi deewana
CHAPTER – 10
LIGHT-REFLECTION
& REFRACTION
Light is a form of energy, which enable us to see the object.
In this chapter we will study the phenomena of reflection and refraction using the property of light i.e. straight line propagation (Light wave travel from one point to another, along a straight line).
Reflection of Light
When the light is allowed to fall on highly polished surface, such as mirror, most of the light gets reflected. normal Laws of Reflection
1.
2.
The angle of incidence is always equal to angle of reflection.
—
i=— r The incident ray, reflected ray and the normal to the reflecting surface at the point of incidence lie in the same plane.
Reflected ray Incident ray i
r
Points of incidences
Image formed by Plane Mirror (Plane reflecting surface)
Plane Mirror
A1
A
Object
B
Image
—
i
—
r
B1
1)
Virtual (imaginary) & Erect (Virtual screen.) 2)
Laterally inverted (The left side of object appear on right side of image)
3)
The size of image is equal to that of object
96
The image that do not form on
X-Science
4.
The image formed is as for behind the mirror as the object is in front of it.
Reflection of light by spherical Mirrors
Mirrors, whose reflecting surface are curved inward or outward spherically are called spherical mirror.
For example - Spoon } fisurface of shinning spoon can be considered
The curved as curved mirror.
If it is curved inward fi mirror
Act as concave
If it is curved outward fi mirror.
Act as a convex
Reflecting side Reflecting side Concave
Mirror
OR CONVERGING
MIRROR
Convex mirror OR DIVERGING
MIRROR
Few Basic terms related to Spherical Mirror
Principal
Axis
C
Radius of curvature
R
F f focal length
Concave
Mirror
P
Radius of curvature
R
Principal
Axis
P
97
f
F
focal length
Convex
Mirror
C
X-Science
1.
Principal axis : Line joining the pole and centre
LIGHT-REFLECTION
& REFRACTION
Light is a form of energy, which enable us to see the object.
In this chapter we will study the phenomena of reflection and refraction using the property of light i.e. straight line propagation (Light wave travel from one point to another, along a straight line).
Reflection of Light
When the light is allowed to fall on highly polished surface, such as mirror, most of the light gets reflected. normal Laws of Reflection
1.
2.
The angle of incidence is always equal to angle of reflection.
—
i=— r The incident ray, reflected ray and the normal to the reflecting surface at the point of incidence lie in the same plane.
Reflected ray Incident ray i
r
Points of incidences
Image formed by Plane Mirror (Plane reflecting surface)
Plane Mirror
A1
A
Object
B
Image
—
i
—
r
B1
1)
Virtual (imaginary) & Erect (Virtual screen.) 2)
Laterally inverted (The left side of object appear on right side of image)
3)
The size of image is equal to that of object
96
The image that do not form on
X-Science
4.
The image formed is as for behind the mirror as the object is in front of it.
Reflection of light by spherical Mirrors
Mirrors, whose reflecting surface are curved inward or outward spherically are called spherical mirror.
For example - Spoon } fisurface of shinning spoon can be considered
The curved as curved mirror.
If it is curved inward fi mirror
Act as concave
If it is curved outward fi mirror.
Act as a convex
Reflecting side Reflecting side Concave
Mirror
OR CONVERGING
MIRROR
Convex mirror OR DIVERGING
MIRROR
Few Basic terms related to Spherical Mirror
Principal
Axis
C
Radius of curvature
R
F f focal length
Concave
Mirror
P
Radius of curvature
R
Principal
Axis
P
97
f
F
focal length
Convex
Mirror
C
X-Science
1.
Principal axis : Line joining the pole and centre