Refractive Index of a Glass Slab Viva Questions
Refractive Index of a Glass Slab Using Travelling Microscope
Viva Questions and Answers
(i) What is meant by the refractive index of the material of
a transparent medium?
Ans: Refractive index is called as the measure of the
bending of a light ray when passing from one medium to another.
(ii) Give the relation for the refractive index of a medium
in terms of velocity of light.
Ans: n = c/v, where n is refractive index, c is velocity of light
and v is velocity of substance.
(iii) What is Snell's law of refraction?
Ans: Snell's law is a formula that defines the relationship
between angles of incidence and refraction. The mathematical formula is given
below.
n1sinθ1 = n2sinθ2
(iv) Give an equation for the refractive index of a glass
slab in terms of real and apparent thicknesses of a glass slab.
(v) What is meant by shift in the position of image produce
by a glass slab?
(vi) Aim of the refractive index of a glass slab Experiment?
Ans: To determine the refractive index of the material of a
glass slab.
(vii) Apparatus of the refractive index of a glass slab
Experiment?
Ans: The glass slab, a travelling microscope, chalk powder,
etc.
(viii) Theory of the refractive index of a glass slab
Experiment?
Ans: The refractive index of the material of the glass slab
is given by,
μ = Real thickness of the glass slab/ Apparent thickness of
the glass slab
(ix) Procedure of the refractive index of a glass slab
Experiment?
Ans: A few small grains of chalk power is sprinkled on the
horizontal base of the travelling microscope. The microscope is kept vertically
and adjusted to get a well focussed image of the chalk powder. The reading R1
of the microscope is taken on its vertical scale. The glass slab is placed over
the chalk powder. The microscope is raised and adjusted to get the image of the
chalk powder. The microscopic reading R2 is again taken. The chalk
powder is sprinkled over the glass slab. The microscope is raised further to
get the chalk powder focussed. The reading R3 of the microscope is
noted. The real thickness of the glass slab,
t = R3 - R1
The apparent thickness of the glass slab,
t' = R3 - R2
The refractive index of the material of the glass slab is
calculated by the equation,
μ = Real thickness /Apparent thickness = t/ t' = (R3
- R1)/(R3 - R2).
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