Page 15 - 10-phy-12 Geometrical Optics
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pin P at about 5cm away from the pin Q as
shown in Fig 12.4.1.
5. Observe through the side AC and locate the What happens if line PQ is
position where both the pins P and Q come in not slanting to lineAB?
! a line.
Ÿ Prism must be correctly 6. Keeping eye in the same position fix two more pins R and S on the
placed within its side AC in such a way that all the four pins appear to be in the same
boundary line and 7. straight line.
should not be 8.
disturbed. 9. Remove the prism and pins and encircle the pin pricks carefully.
10.
Ÿ Pins must be vertical 11. Join points P and Q by a straight line and extend this line to the face
Ÿ Do not press the pins AB. It meets the face AB at point O.
very hard in the board Similarly, join points R and S by a straight line and extend it to the
otherwise you may hurt face AC. It meets AC at point O′.
your thumb and it will
become difficult to Join points O and O¢ by a straight line. POO¢S is the path of the light
remove them. ray passing through the prism.
Ÿ The angle of incidence
must be 35° to 40°.
Extend the incident ray PQ forward and emergent ray RS backward.
They intersect each other at a point K.
12. Measure the angle K with the help of
protractor. This is the angle of deviation ‘D’.
13. Does the angle of deviation
Repeat the experiment four times more for remain the same for different
different values of angle of incidence and angles of incidence?
find the angle of deviation in each case.
Observations No. of Obs. Angle of incidence Angle of deviation
and Data i D
Processing 1
2
3
4
5
Conclusions
17
shown in Fig 12.4.1.
5. Observe through the side AC and locate the What happens if line PQ is
position where both the pins P and Q come in not slanting to lineAB?
! a line.
Ÿ Prism must be correctly 6. Keeping eye in the same position fix two more pins R and S on the
placed within its side AC in such a way that all the four pins appear to be in the same
boundary line and 7. straight line.
should not be 8.
disturbed. 9. Remove the prism and pins and encircle the pin pricks carefully.
10.
Ÿ Pins must be vertical 11. Join points P and Q by a straight line and extend this line to the face
Ÿ Do not press the pins AB. It meets the face AB at point O.
very hard in the board Similarly, join points R and S by a straight line and extend it to the
otherwise you may hurt face AC. It meets AC at point O′.
your thumb and it will
become difficult to Join points O and O¢ by a straight line. POO¢S is the path of the light
remove them. ray passing through the prism.
Ÿ The angle of incidence
must be 35° to 40°.
Extend the incident ray PQ forward and emergent ray RS backward.
They intersect each other at a point K.
12. Measure the angle K with the help of
protractor. This is the angle of deviation ‘D’.
13. Does the angle of deviation
Repeat the experiment four times more for remain the same for different
different values of angle of incidence and angles of incidence?
find the angle of deviation in each case.
Observations No. of Obs. Angle of incidence Angle of deviation
and Data i D
Processing 1
2
3
4
5
Conclusions
17
