A student has to trace the path of a ray of
light passing through a rectangular glass sláb
for four different values of angle of enci,
-dence. (a) write two emportant precautions
for this experiment 1b) list two conclusions
the student will draw based on his experiment.
Answers
precautions
1 he should watch the glass slab only at one angle
2 the measurements should be taken by seeing perpendicularly towards the protractor or a scale
conclusion
1 the incident ray and the emergent ray out of the glass slab will be parallel to each other
2 the angle of refraction and the angle of incidence for the second ray will be equal
(a) The two important PRECAUTIONS for this experiment are:
• Make sure Glass of slab is clean and it must be free from air bubbles.
• The Angle of incidence should be lies between 30 degree and 60 degree.
(b) The CONCLUSIONS that the student will draw based on his experiment are:
• The incident ray, refracted ray and normal, all lie in the same plane.
• The incident ray and the refracted ray are on opposite side of the normal
•sin i / sin r = constant
•Angle of Incidence = Angle of Emergence
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