Propogation of light (Shadow)

1. Name:-Shaikh Yasmin Rashid
Std:-VII
Chapter:-Propogation of light

2. Propogation of light
shadow

3. Transperency of material depends upon the
amount of light that can pass through it.

4. Light travels in a straight line

5. What happens when an opaque object comes
in the path of light?

6. To form a shadow a source of light is required

7. Can transparent object form a shadow?

8. Transparent object allows all the light to pass
through…..so no shadow is formed

9. Why we cannot see the shadow of a bird flying
high

10. Shadow of a bird flying low

11. To form a shadow a screen is required

12. Screen should be behind the object

13. Screen is required to caste a shadow

14. Characteristics of shadow
Shadows are always black

15. Shadow only shows the shape or outline of
object

16. Shape of the shadow changes with the change
in the position of the opaque body

17. How to change the size of shadow?

18. Requirements for shadow

19. Two parts of shadow

20. Umbra:darker part of shadow

21. Penumbra:fainter part of a shadow

22. What does Islam says about shadow?

23. Fun with shadows

24. EVALUATION
• The path of light is ________
• The penumbra is faint.(say true or false)
• Fun time:You and your friend is standing at a same distance from a
wall with a same sized ball.what would you do to make a bigger
shadow on a wall without changing a ball.