8202 19642 newton ring
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Transcript of 8202 19642 newton ring
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NEWTON’s RINGs
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To form Newton’s Rings and then find the radius of curvature of a given plano-convex lens
AIM OF THE EXPERIMENT
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Schematic of the Experiment
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G Glass plate
L Plano convex lens
G1 Beam Splitter
M Microscope
C Focussing lens
S Source of light
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EXPERIMENTAL SETUP
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Telescope holder
Tilting Screw
Focussing screw
Beam Splitter and Lens holder
Main Scale
Vernier Scale
Source of light
Eye Piece
Objective
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Beam Splitter
Plano-Convex Lens
Source of light
Objective
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Newton’s rings as observed under the microscope
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CALCULATION
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Step 1- To Find Least Count of the microscope
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20 Main Scale Divisions in 1 cm
50 Vernier Scale Divisions
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LEAST COUNT OF THE MICROSCOPE
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Vernier Scale
This is your main scale reading
Main Scale
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This is your vernier scale reading
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Final Reading = Main Scale Reading +( Vernier Scale Reading * Least Count)
Final Reading of a Ring
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>>Place the crosswire on 20th dark ring on the left side. >>Note the MS and vernier readings and move towards right to note the readings for 18th , 16th , 14th ….2nd rings. >>Keep moving towards other side of the central ring and note down the reading for 2nd , 4th,….., 20th rings
Crosswire
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Precautions
In order to avoid the backlash error, move the crosswire only in one direction (e.g left to right) while recording the data
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Data entry in the computer
Login to the PC
Applications AccessoriesTerminal
Type “ring” (without quote) in the Terminal & follow up the instructions
Fit the graph with a straight line y=a0*x and estimate the slope a0 from the fit.
Enter the value of slope in the terminal when it is asked for.
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END