1*Spectrometer
Learn it
• Heavy base
• Turntable
• Collimator
• Astronomical Telescope
• Cross-threads in focus
• Distant object appears in focus
• Slit is in focus
• Width of the slit
• Level the turntable
2*Show that light travels as a wave
*Diffraction or interference
3*Colours of the Rainbow & Wavelengths
*Red - 7 × 10⁻⁷ m
Orange
Yellow - 6 × 10⁻⁷ m
Green
Blue - 5 × 10⁻⁷ m
Indigo
Violet - 4 × 10⁻⁷ m
4The Grating Constant (The Grating spacing)
The distance between two adjacent slits on a diffraction grating
5*If a Grating has n lines per mm, d = ?
*
d = [1 ÷ (n × 1000)] metres
6*Prove: nλ = dSinθ
*Constructive interference will occur at angle θ if |AB| is a whole number of wavelengths.
i.e. |AB| = nλ where n = 1, 2, 3, etc.
[Need to learn text, but there's more to the proof than that]
7*Show that light is a transverse wave
*Polarisation
8Dispersion
The separating out of the different wavelengths (colours) present in light
9*Primary and Secondary Colours
*Primary: Red, Green, Blue
R+G: Yellow
R+B: Magenta
G+B: Cyan
10Secondary Colour
formed when two primary colours are mixed in equal intensity
11Complementary Colour
A primary colour and a secondary colour that when mixed give white are called complementary colours
12*Lights and which is refracted more
*Prism: Violet the most
Grating: Red the most
13*Electromagnetic Spectum
*Gamma ray - 0.01 nm
X - Ray - 1 nm
UV - 0.1 μm
Visible Light - 0.4-0.7 μm
Infrared - 0.01 mm
Microwaves - 1cm
TV & Radio: 1m - 1km