ppt of light- physics chapter class 7 . reflection and refraction also included. Anjali Kumari - dps bokaro. ppt by my physics teacher- Md. Obaidullah Ansari.
ppt of light- physics chapter class 7 . reflection and refraction also included. Anjali Kumari - dps bokaro. ppt by my physics teacher- Md. Obaidullah Ansari.
Step by step procedure in doing Ray Tracing Diagram for Plane Mirrors, Curved Mirrors, and Lenses. Bonus: Corrective Lens and Optical Devices are included in the presentation as well. Enjoy!
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2. ⦁ “Light is an electromagnetic ray that travels in a straight
line”
⦁ Reflection of Light:
◦ When light falls on a surface and is reflected back into
the same medium, we say reflection has taken place
⦁ Refraction of Light:
◦ When light travels from one medium to another it
bends from its original path
◦ This phenomenon is called refraction
2
3. ⦁ Incident Ray: The ray of light that falls on the
reflecting surface
⦁ Reflected Ray: The ray of light that is sent back by
the reflecting surface
⦁ Normal: The normal is a line at right angle to the
reflecting surface to the point of incidence
⦁ Angle of Incidence: It is the angle made by the
incident ray and the normal
3
4. ⦁ Angle of Reflection: It is the angle made by the reflected ray
and the normal
⦁ Object: It is the “thing” that forms an image on the screen
⦁ Image: It is the reflection of the object on the screen
⦁ Virtual Image: The image that cannot be obtained on a screen
(a surface where image is formed)
⦁ Real Image: The image that is formed directly on the screen
4
5. ⦁ Laws of Reflection of light are:
◦ The angle of incidence is equal to the angle of reflection
◦ The incident ray, the reflected ray and the normal to the
mirror at the point of incidence all lie in the same plane
◦ The incident ray and the reflected ray lie on either side of
the normal
5
6. ⦁ The image formed in a plane is mirror is…
1. Virtual and Erect
2. Of the same size as of the object
3. At the same distance from the mirror as the object is in front
of it
4. Laterally inverted
6
7. ⦁ Concave Mirror: A spherical mirror that has its reflecting surface
curved inwards
⦁ Convex Mirror: A spherical mirror that has its reflecting surface
curved outwards
⦁ There are some important terms to be explained first in terms of
Spherical mirrors. They are:
◦ Centre of Curvature
◦ Focus
◦ Principal Axis
◦ Pole
◦ Focal length
◦ Radius of Curvature
7
8. ⦁ Center of curvature (C): It is the centre of the
sphere of which the mirror is a part
⦁ Radius of curvature (CP): It is the radius of the
sphere of which the mirror is a part
⦁ Pole (P): It is the centre of the spherical mirror
⦁ Principal axis (X-Y): It is the straight line passing
through the centre of curvature and the pole
8
10. ⦁ Principal Focus:
◦ Focus of Concave Mirror: It is a point
on the principal axis, where all the rays
parallel to the principal axis converge
◦Focus of Convex Mirror: It is a point on
the principal axis, where the reflected
rays appear to converge
⦁ Focal length of Spherical Mirrors:
◦ The distance between the pole and the principal focus is called the focal
length of the spherical mirror
⦁ The Radius of Curvature is two times the Focal Length of any spherical mirror
10
11. ⦁ If in a concave mirror, a ray of light parallel to the principal
axis after reflection will pass through the focus or appear to
diverge from the focus in case of convex mirror
⦁ A ray passing through the focus of a concave mirror, after
reflection, will emerge parallel to the principal axis