January 8, 2002PSYC202-005, Term 2, Copyright Jason Harrison 20021 Light: Properties and Characteristics Electromagnetic energy you can see.

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Presentation transcript:

January 8, 2002PSYC , Term 2, Copyright Jason Harrison Light: Properties and Characteristics Electromagnetic energy you can see

Properties of light Carrier of information Electromagnetic wave –Light is the region of the electromagnetic spectrum that can be perceived by human vision 0.7 um

Properties of light Travels in straight lines

angle of incidence (i) = angle of reflection (r) Properties of light Reflects from surfaces

sin (  i ) = n sin (  r ) n is refractive index of dense material n ≈ (depends on material) Properties of Light Refracts at boundaries of transparent materials

Characteristics of Light Frequency (f)

Characteristics of Light Frequency (f)

Characteristics of Light Wavelength = c/f

Frequency corresponds to colour - high frequency (short ) = blue (380 nm) - low frequency (long ) = red (720 nm) Many frequencies aren’t seen by humans - higher frequencies -> ultraviolet (UV) - lower frequencies -> infrared (IR)

January 8, 2002PSYC , Term 2, Copyright Jason Harrison Frequency corresponds to colour

January 8, 2002PSYC , Term 2, Copyright Jason Harrison Electromagnetic Spectrum

January 8, 2002PSYC , Term 2, Copyright Jason Harrison Absorption of light by atmosphere From

January 8, 2002PSYC , Term 2, Copyright Jason Harrison Absorption of light by water Electric Current From

Characteristics of Light Amplitude (A)

Characteristics of Light Amplitude (A)

Amplitude determines intensity (Amplitude) 2 = Energy/second = intensity – high amplitude = bright light – low amplitude = dim light

Finally What was the purpose of this presentation? Which question remains unanswered?

January 8, 2002PSYC , Term 2, Copyright Jason Harrison For Thursday’s tutorial… Reading for tutorial: –Ramachandran and Blakeslee, chapter 1 Assignment due in tutorial: – For Next week… Reading for lecture: Gregory, Ch 4-5 Reading for tutorial: Rama, Ch 2

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