SPEED OF LIGHT SK077
Exp-1 To determine the speed of light in air.
- 1MHz internal modulation frequency.
- Dual channel photo detector.
- Speed of light.
- Internal modulation.
- Laser beam.
- Peak difference.
- Path difference.
Principle and Working :
The LASER beam from the transmitter strikes the beam splitter to split the beam in two perpendicular directions. The first beam is transmitted through transmitter directly and is received in first channel of the receiver. The second perpendicular beam from beam splitter travels a larger distance by being reflected back from a mirror placed about 5 meter or more and is received in second channel of the receiver.
In the present setup, the time difference between the two peaks of received LASER signals can be observed on a oscilloscope (>40MHz) and can be used to calculate the speed of light.
Contents:
| Cat. No. | Item Name | Qty |
| CD818 | Laser transmitter module | 1 |
| CD819 | Laser receiver module | 1 |
| R7950 | Power adaptor 5V | 2 |
| CD820 | Beam splitter | 1 |
| SL752 | Convex lens f=50mm | 2 |
| SG110 | Cylindrical base | 5 |
| C821 | Reflecting mirror in mount | 1 |
| SG101 | 'A' base | 1 |
| SG038 | Support rod | 1 |
| C7659 | BNC to BNC cable | 2 |
- Laser Transmitter Module CD818
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SPECIFICATIONS Peak wavelength : 635nm
Modulation frequency : 1MHz, Internal
Connection output : BNC (F)
Operating voltage : 5V DC
Operating current : 250mA
Optical power : 0.4 to 0.8mW
Laser product : Class II
Operating temperature : 0 to 40°C
Storage temperature : -10 to 50°C
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- Laser Receiver Module CD819
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SPECIFICATIONS Photo detector (BPW34) : Silicon PIN Photo-diode
Reverse voltage : 32V
Maximum dark current : 30nA
Peak wavelength : 850nm
Rise time : 20ns
Fall time : 20ns
Angle degrees : 60°, Half Intensity
Photocurrent : 80uA
Power dissipation : 150mW
Responsivity : 0.62A/W
Radiant sensitive area : 2.65 x 2.65mm (LxW)
Connection output : BNC (F)
Operating voltage : 5V DC
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- 'A' Base SG101
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SPECIFICATIONS Mount : Support rod upto 8-14mm.
Material : Cast iron
Length : 200mm
Type : ‘A’ shape
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- Cylindrical Base SG110
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SPECIFICATIONS Material : Ferrous
Mount : Rod 10-14mm dia
: Flat object up to 10mm
Groove : Slide object, 30x10mm (LxW)
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- Bosshead SW092
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SPECIFICATIONS Object type : Square & round shape
Object size : Up-to 13mm dia
Material : Aluminium alloy
Object can be held both vertically and horizontally.
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- Stand Rod SG038
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SPECIFICATIONS Length : 1m
Diameter : 10mm
Material : Mild Steel
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- Beam Splitter in Holder CD820
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SPECIFICATIONS Size : 50x50x10mm
R:T : 50:50%
Surface : λ/5
Mounting Rod : 10mm diameter
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- Reflecting Mirror in Mount C821
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SPECIFICATIONS Size : 50x50x6mm
Surface : λ/5
Mounting Rod : 10mm diameter
Coating : Front coated
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- Convex Lens in Holder SL752
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SPECIFICATIONS Focal Length : 50mm
Lens : 50 mm dia.
Frame Diameter : 130 mm to avoids scattering of lights
Rod Diameter : 10 mm
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* Additionally Required
Oscilloscope >40MHz is not supplied with the setup.
Light & Optics Experiments
- Spectrometry Kit
- Michelson Interferometer
- Precision Interferometer (Imported)
- Holography & Interferometry Kit (Imported)
- Two Beam Interference
- Newton's Rings Apparatus
- Advanced polarimeter
- Laurent's Half Shade Polarimeter
- Polarization of Light & Verification of Malus Law
- Polarization of Light by Half-Wave Plate
- Polarization of Light by Quarter-Wave Plate
- Kerr Effect
- Faraday Effect
- Diode Laser Kit
- Diode Laser Diffraction Experiment
- He-Ne Laser kit
- Focal Length of Combination of Lenses Using Nodal Slide Assembly
- Optical Fiber Kit
- Optics Experiment Kit
- Resolving Power of a Telescope
- Speed of Light
- Particle Size Measurement
- Photoconductivity