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Luminous object: something that produces its own light The Moon is bright only because it reflects the Suns light. Therefore, the Moon is NOT luminous.

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Presentation on theme: "Luminous object: something that produces its own light The Moon is bright only because it reflects the Suns light. Therefore, the Moon is NOT luminous."— Presentation transcript:

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

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

3

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

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 and mercury d) fluorescence: light that is emitted during exposure of the source to ultraviolet (UV) light compact fluorescent light (CFL) bulb tubular fluorescent light 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 dont 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 forensic science black light theatre fluorescent fish money

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