As shown in figure waves with identical wavelengths and amplitudes and which are intially in phase travel through difference media. Ray 1 travels through air and Ray 2 through a transparent medium for equal length L, in four different situations. Rays reach a common point on the screen. The number of wavelengths in length L is `N_(2)` for Ray 2 and `N_(1)` for Ray 1. In the following table, values of `N_(1)` and `N_(2)` are given for all four situations. The order or the situations according to the intensity of the light at the common point in descending order is Situations 1 2 3 4 `N_(1)` 2.75 1.80 3.00 3.25 `N_(2)` 2.75 2.80 3.25 4.00 A. `I_(3)=I_(4)gtI_(2)gtI_(1)`B. `I_(1)gtI_(3)=I_(4)gtI_(2)`C. `I_(1)gtI_(2)gtI_(3)gtI_(4)`D. `I_(2)gtI_(3)=I_(4)gtI_(1)`

As shown in figure waves with identical wavelengths and amplitudes and

1.	As shown in figure waves with identical wavelengths and amplitudes and which are intially in phase travel through difference media. Ray 1 travels through air and Ray 2 through a transparent medium for equal length L, in four different situations. Rays reach a common point on the screen. The number of wavelengths in length L is `N_(2)` for Ray 2 and `N_(1)` for Ray 1. In the following table, values of `N_(1)` and `N_(2)` are given for all four situations. The order or the situations according to the intensity of the light at the common point in descending order is Situations 1 2 3 4 `N_(1)` 2.75 1.80 3.00 3.25 `N_(2)` 2.75 2.80 3.25 4.00 A. `I_(3)=I_(4)gtI_(2)gtI_(1)`B. `I_(1)gtI_(3)=I_(4)gtI_(2)`C. `I_(1)gtI_(2)gtI_(3)gtI_(4)`D. `I_(2)gtI_(3)=I_(4)gtI_(1)`
Answer» Correct Answer - D Path difference `Deltax_(1)=(lamda)/(2),Deltax_(2)=lamda,Deltax_(3)=(lamda)/(4),Deltax_(4)=(3lamda)/(4)` Therefore `I_(2)gtI_(3)=I_(4)I_(1)`

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