As shown in figure, waves with identical wavelengths and amplitudes and which 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 wavelengths in length L is N2 for Ray 2 and N1 for Ray 1. In the following table, values of N1 and N2 are given for all four situations.
Situations
1
2
3
4
N1
2.25
1.80
3.00
3.25
N2
2.75
2.80
3.25
4.00
The order of the situations according to the intensity of the light at the common point in descending order is