Reflection .pptx
- 3. How does light help us to see objects in dark?
- 4. What do these experiences suggest?
- 5. What is light ? Light is a radiation or a form of energy that our eyes can detect. Light enables us to view our surroundings. Light travels from one place to another in a straight line.
- 7. QUESTION The path of light is a)Always a straight line. b)A curved line c) A zig zag line d)Depends on the medium What is rectilinear propagation?
- 8. How we can change the pathof light???
- 9. What is shiny surface ? Write few e.g. Of shiny surface .
- 10. What happens when light fallson a polished or ashiny surface?
- 11. Reflection of light There are some certain situations in which a mirror or shiny surfaces like stainless steel plate or spoon act as a mirror, can change in direction of light that falls on it. So, this process of change in direction of light by a mirror is called a reflection of light.
- 12. Have you ever seen the reflection of trees or mountain in water ?
- 14. Activity Direct the beam of light on the mirror from the torch with slits. Place the torch in such a way that its light is seen along the chart paper on the board. Now adjust its position so that the light from the torch strikes the plane mirror at an angle.
- 15. Questions Change in the path of light after striking a mirror is called a) Reflection of light b)Rectilinear propagation of light c) lateral inversion d)Dispersion Is the change of direction of light that is falling on a mirror. a) Direction b)Conversion. c) Reflection d)None of these
- 16. Where did you see this type of mirror? Have you ever seen this type of mirror? Do we use this type of mirror in our house to get ready for an event or parties? Where did you saw this type of mirror?
- 17. w h i c h type of m i r ror d o w e u s e i n o u r h o u s e s ?
- 18. A c t i v i t y t i m e
- 19. Characteristics An image is said to be erect if the image is formed the same side up as that of the object. The image will be called inverted if it is formed upside-down compared to the object.. Image---- virtual(not real) Image---- erect/upright Image size = object size Image distance = object distance.
- 20. V i d e o https://youtu.be/x4XmyE1p8SE Did you find any relation between the distance of the image from the mirror and that of the object in front of it ?
- 21. Questions The image which can be caught on screen is called a) Real image b) Virtual image c) Shadow d)Impression An image being in such a position that top & bottom are reversed is: a) Erect b) Virtual c) Concave d)Inverted
- 22. Question An image formed by plane mirror which is upright is : a)Virtual b)Concave c)Erect d)convex
- 23. R E C APITULAT I O N : What is light? How light travels. Explain reflection of light. What is an image? What is real and virtual image?
- 24. Home work 1)state difference between luminous object & non-luminous objects. With suitable example. 2)Suppose we wish to obtain the real image of a distant tree. Explain two possible ways in which we can do it.