Question

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.
​

Answer 1

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

Answer 2

(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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