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luminous object: something that produces

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Presentation on theme: "luminous object: something that produces"— Presentation transcript:

1 luminous object: something that produces
its own light The Moon is bright only because it reflects the Sun’s light. Therefore, the Moon is NOT luminous.

2 1. Incandescence: light that is emitted from a very hot object

3

4 2. Luminescence: light that is generated without heating the object
- types: a) electric discharge neon lights sodium vapour lamps

5 Bohr Model of the Hydrogen Atom

6 LEDs (light-emitting diodes)‏

7 b) chemiluminescence: light that is produced by a chemical reaction
without a rise in temperature

8 c) bioluminescence: light that is produced by a biochemical
reaction in a living organism

9 d) fluorescence: light that is emitted during exposure of the source
to ultraviolet (UV) light and mercury tubular fluorescent light bulb compact fluorescent light (CFL) bulb

10 Efficiency of Fluorescent Vs. Incandescent Bulbs

11 Even though fluorescent bulbs are 4X as efficient as incandescent
bulbs (20% vs. 5%) , some people don’t like them because: they find the light from fluorescent bulbs to be harsh. these lamps contain small amounts of mercury vapour, a toxic metal.

12 Because they contain mercury, used
fluorescent lamps CANNOT be thrown in the garbage. In Oakville, Rona & The Home Depot will take back your used fluorescent bulbs.

13 Uses of Fluorescence money black light theatre fluorescent fish
forensic science

14 e) phosphorescence: light that is emitted due to exposure of
the source to UV light, and that continues to be emitted for some time in the absence of the UV light

15 Reflection diagram

16 Characteristics of Images
Size bigger or smaller Attitude upright or inverted Location closer or farther Type real or virtual

17 Curved mirrors

18 Lens and mirror equation

19 Refraction diagram

20 C-speed of light in a vacuum 3.0 x 10 8m/s V-speed of light in medium
Index of refraction n =c/v C-speed of light in a vacuum 3.0 x 10 8m/s V-speed of light in medium

21 Internal reflection

22 Lenses

23 Diverging lens

24 The eye

25 Colour Theory


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