Wave OpticsHard
Question
As shown in arrangement waves with identical wavelengths and amplitudes and that are initially in phase travel through different media, Ray 1 travels through air and Ray 2 through a transparent medium for equal length L, in four different situations. In each situation the two rays reach a common point on the screen.The number of wavelength in length L is N2 for Ray and N1 for Ray 1. In the following table, values light at the common point in descending order is :
Options
A.I3 = I4 > I2 > I1
B.I1 > I3 = I4 > I2
C.I1 > I2 > I3 > I4
D.I2 > I3 > I4 > I1
Solution
Path difference
ᐃx1 =
, ᐃx2 = λ, ᐃxs = 
, ᐃx4 = 
Therefore I2 > I3 = I4 > I1.
ᐃx1 =
, ᐃx2 = λ, ᐃxs = , ᐃx4 = Therefore I2 > I3 = I4 > I1.
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