light and optics

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OPTICS

2. 2
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Y
Y
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İllumination and Shadows

3. 2
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Y
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luminous Intensity
The rate at which light spreads over a
surface of a given area some distance from
a source.
Its unit is candela(cd)
The intensity varies with the distance from
the source and the power of the source.

4. 2
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Y
Y
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luminous flux
• Luminous flux is the quantity of the energy
of the light emitted per second in all
directions.

5. 2
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Y
Y
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İllumination
• The luminous flux per unit area at any
point on a surface exposed to incident
light.

6. 2
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Y
Y
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7. 2
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Y
Y
E
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m
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8. 2
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Y
Y
E
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Photometer

9. 2
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Y
Y
E
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10. 2
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Y
Y
E
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m
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11. 2
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Y
Y
E
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Shadow formation
• A shadow is formed where light is
'missing'. A dark shadow (umbra) is
formed where no light falls and a light
shadow (penumbra) is formed where
some light falls, but some is blocked.

12. 2
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Y
Y
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Point Light Source

13. 2
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Y
Y
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Two Point Light Source

14. 2
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Y
Y
E
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Two Point Light Source

15. 2
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Y
Y
E
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Circular light source

16. 2
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Y
Y
E
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Circular light source

17. 2
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Y
Y
E
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Eclipse of the sun

18. 2
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Y
Y
E
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Draw the shadow

19. 2
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Y
Y
E
ğ
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Draw the shadow

20. 2
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Y
Y
E
ğ
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Draw the shadow

21. 2
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Y
Y
E
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How observers will see the light
source?

22. 2
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Y
Y
E
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m
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Reflection and Plane Mirrors

23. 2
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Y
Y
E
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Image Formation with Plane mirrors

24. 2
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Y
Y
E
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Types of images
(a) Real Image
This is one through which the light rays actually
pass and which can be formed on a screen.
Examples of real images are the image formed on
the film in a camera or on the retina of your eye
(b) Virtual Image
This is one through which the rays do not pass,
they only appear to come from it. Examples of
virtual images are the image formed by a
magnifying glass when used to look at a small
object and that in a plane mirror.

25. 2
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Y
Y
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Region of Sight

26. 2
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Y
Y
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How the rays leave the system?

27. 2
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Y
Y
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Which points does the observer see from the mirror?

28. 2
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Y
Y
E
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29. 2
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Y
Y
E
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Draw the images of the objects

30. 2
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Y
Y
E
ğ
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Draw the image

31. 2
1
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Y
Y
E
ğ
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Draw the image

32. 2
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Y
Y
E
ğ
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m
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33. 2
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Y
Y
E
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34. 2
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Y
Y
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Which ray can pass through K?

35. 2
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Y
Y
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Draw images of AB

36. 2
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Y
Y
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Which points does the observer see from the mirror?

37. 2
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Y
Y
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38. 2
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Y
Y
E
ğ
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39. 2
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Y
Y
E
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40. 2
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Y
Y
E
ğ
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