Astr512, Spring 2008: Group Beaton/Fields/Privon/Whelan Lab 4 Photo Journal: Results Photos


Group Beaton/Fields/Privon/Whelan
Lab 4 Photo Journal: Results Photos




David, working out the best way to find the focal length of a diverging lens

Nicole, who suggested to measure the effective focal length of a diverging and converging lens, to great success

David at work

Converging on the focus




There are Twenty-Six Objects in the Bag-o-Optics. They are Described Below


1: A prism
Dimensions: 2.037'' X 0.982'' X 1.003''
Chips along the bottom edge of the prism
2: A prism
Dimensions: 1.982'' long, 0.983'' to a side, equilateral
1 side chipped
3: A diffraction grating
Dimensions: 1.347'' X 0.921''
6600 lines per inch (260 lines/mm)
small scratches and dents on surface
4: A diffraction grating
Dimensions: 1.358'' X 0.904''
6600 lines per inch (260 lines/mm)
small scratches and dents on surface
5: A slab of glass, unknown type
diameter = 1.998''
thickness = 0.086''
6: A slab of glass, unknown type
diameter = 1.996''
thickness = 0.086''
7: A slab of glass, unknown type
diameter = 1.992''
thickness = 0.086''
8: A Mirror
Dimensions: 1.565'' X 1.194'' X 0.127''
Not cut perfectly square
9: A neutral density filter
diameter = 0.898''
thickness = 0.044''
10: A diverging lens
diameter = 1.295''
thickness = 0.378'' (at edge)
f = -1''
f/ = -0.77
11: A diverging lens
diameter = 1.298''
thickness = 0.377'' (at edge)
f = -1''
f/ = -0.77
12: A diverging lens
diameter = 1.572''
thickness = 0.255'' (at edge)
f = -2''
f/ = -1.27
13: A converging lens
diameter = 1.413''
thickness = 0.440'' (at center)
f = 4''
f/ = 2.83
14: A converging lens, eyeglass
diameter1 = 1.612''
diameter2 = 1.488''
thickness = 0.094'' (from bulge in center to edge)
f = 18.5''
f/ = 11.48
15: A converging lens, eyeglass
diameter1 = 1.609''
diameter2 = 1.488''
thickness = 0.128'' (from bulge in center to edge)
f = 14''
f/ = 8.70
16: A magnifying lens system
distance between lenses = 0.486''
lens diameters = 0.165''
focal length: very hard to measure: certainly less than 1/8''
17: A magnifying lens system
distance between lenses = 0.487''
lens diameters = 0.165''
focal length: very hard to measure: certainly less than 1/8''
18: A converging lens
diameter = 1.648''
thickness = 0.526'' (at center)
f = 2''
f/ = 1.21
Obvious defects: bubbles in the glass
19: A converging lens
diameter = 1.650''
thickness = 0.547'' (at center)
f = 2''
f/ = 1.21
Obvious defects: bubbles in the glass, large chip on the side
20: A converging lens
diameter = 1.649''
thickness = 0.550'' (at center)
f = 2'' + 1/16''
f/ = 1.25
Obvious defects: a bubble in the glass
21: A converging lens
diameter = 1.600''
thickness = 0.316'' (at center)
f = 3'' + 5/8''
f/ = 2.27
22: A converging lens
diameter = 1.396''
thickness = 0.296'' (at center)
f = 2'' + 1/8''
f/ = 1.52
Obvious defect: bubbles in glass
23: A converging lens
diameter = 1.396''
thickness = 0.298'' (at center)
f = 2'' + 1/4''
f/ = 1.61
24: A converging lens
diameter = 1.245''
thickness = 0.216'' (at center)
f = 3'' + 1/8''
f/ = 2.51
25: A converging lens
diameter = 1.133''
thickness = 0.377'' (at center)
f = 1''
f/ = 0.88
26: A converging lens
diameter = 1.133''
thickness = 0.377'' (at center)
f = 1'' + 1/8''
f/ = 0.99

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