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thankyou, miss.

Hello Rakshith, thanks . If you can mention your schoolname, city, I can add your name in my website under Appreciations column. kaustubhan

Govinda dasa college ,Surarthkal ,Mangalore, karnataka

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College Name:North Lakhimpur College Town:North Lakhimpur Dist.:Lakhimpur State : Assam

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Somnath, what exactly you want to remove -can you clarify.

Thanks!

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I am 1st year student in Jabalpur engineering college Madhya Pradesh India Have a nice day 👍

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yes, the real source and the virtual sources will be formed along the same vertical line. This is shown correctly in the 2D slide. Regarding 3D sideview, it is not showing in line, and I will modify it.

Why are they on the same line ?

hello. The important thing here is to understand how and why fringes get created. That's due to a combination of Refraction followed by Interference - wave theory and superposition of peaks and troughs of interfering waves. this as you can see is happening in the zone highlighted. the shape of each fringe is Rectangular as shown. It has a width . It's Length is not important. The width is important because you get alternate dark and bright fringes after each width. The rectangular shape of fringes comes mainly because the Fresnel Prism offers a flat side facing the incoming light beam. I hope this answers your question.

I think nature of fringe depends on separation between source and biprism and as it have small angle it should not depend upon side facing source if I'm incorrect then reply please

Sorry for the mistake, will correct it.

anyways but your explanation is concise and to the point and is way better than others. Can I know which software did you use for the animation?

Thanks, Rawat. One can use many softwares like CAD softwares, 3DS, etc.

Thanks, will use blender or 3DS max.

can i put your comments on my website?

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Welcome

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Lateral Shift which you asked-- it is very simple - the bright&dark fringes shift to left or right on the screen (screen is same as Eyepiece location if we are looking through a lens from the screen center position)...this will happens only when the slit is VERTICAL and Fresnel Biprism is HORIZONTAL, and when the joining flat portion is not properly aligned exactly with center plane. This lateral shift is a defect in experiment setup, but it can be easily removed by aligning the fresnel prism to the central plane. How to align it ? On the Optical bench practical experiment, there is usually a convex lens after the prism and before the eyepiece (screen), and this convex lens amplifies the distortion on the screen (same as our eyepiece) sideways--- farther you move the screen (or eyeiece) away from biprism, more the widening and distortion. Now, adjust the Fresnel prism perpendicular to the light path a little bit till you should not see any movement of bright & dark fringes even if you bring the eyepiece (screen) towards or away from the Fresnel biprism. That means everything is perfectly aligned. The funda is that light beam passing through the tow inclined faces of Biprism should meet exactly at screen center (eyepiece) and also the light passing through the flat joining portion will not have any refraction or bending. Then, Even if we put any convex lens after the Biprism, the central fringe should not move at all, whether we see it closely or from far away. The fringes will not shift left or right . [ But In our video above, note that Fresnel biprism orientation is vertical , not horizontal. Funda of "shift" is the same. Here we have to adjust the prism up-down, instead of left-right, till you see zero shift. Hope this explains your query clearly.

at what distance we kept lens?

depends on optical bench.

ok.thanks