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Physics
Physics
Problem
A ray of light is incident on a parallel slab of thickness
t
t
t
and refractive index
n
n
n
. If the angle of incidence
θ
\theta
θ
is small, then the displacement in the incident and emergent ray will be: (a)
t
θ
(
n
−
1
)
n
\frac{t\theta(n-1)}{n}
n
tθ
(
n
−
1
)
(b)
t
θ
n
\frac{t\theta}{n}
n
tθ
(c)
t
θ
n
n
−
1
\frac{t\theta n}{n-1}
n
−
1
tθ
n
(d) none
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