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Page 20
[20]
10. By proceeding as in step 3-8, determine the value of the
angle of deviation when the angle of deviation is 35°,
40°….55°.
11. Record the observations in tabular form.
12. Plot a graph between the angle of incidence i(along X
axis) and angle of deviation δ(along Y axis). The graph
obtained will be as shown in figure.
13. Note the value of angle of minimum deviation (δm ) from
the graph corresponding to the lowest point i-δ curve as
shown in figure.
RESULT:-
The graph between i and δ shows that as the angle of
incidence increases, the angle of deviation first
decreases, attains a minimum value and then on
increasing the angle of incidence further, the angle of
deviation increases.
The angle of minimum deviation, δm=____ (water)
The refractive index of the material of the prism,
µ = ____
PRECAUTIONS:-
The boundary of the prism, incident ray and
emergent ray should be drawn with a sharp
pencil.
[20]
10. By proceeding as in step 3-8, determine the value of the
angle of deviation when the angle of deviation is 35°,
40°….55°.
11. Record the observations in tabular form.
12. Plot a graph between the angle of incidence i(along X
axis) and angle of deviation δ(along Y axis). The graph
obtained will be as shown in figure.
13. Note the value of angle of minimum deviation (δm ) from
the graph corresponding to the lowest point i-δ curve as
shown in figure.
RESULT:-
The graph between i and δ shows that as the angle of
incidence increases, the angle of deviation first
decreases, attains a minimum value and then on
increasing the angle of incidence further, the angle of
deviation increases.
The angle of minimum deviation, δm=____ (water)
The refractive index of the material of the prism,
µ = ____
PRECAUTIONS:-
The boundary of the prism, incident ray and
emergent ray should be drawn with a sharp
pencil.
