Optics Course : Astigmatic fan/Dial : principle behind and how to use. 

Great that you found it useful

Welcome. Glade to hear your opinion.

welcome

Welcome

" shouldn't the blackest line on the astigmatic fan on mark 11:00 be the vertical one" : would you re phrase, I could not catch your point of view.

would you re see the video up to 6.30 minute , this part explains that each point of the object will be extended in a vertical direction so on looking at a cross, the vertical line of the cross will extend vertically so only its extreme ends will be blurred , on the other hand the horizontal line all its points will extend vertically so the whole line will be blurred. Here we are not dealing with a cylindrical lens. in case of a cylinder we follow rays and see which meridian will come to a focus on the retina. Hope I made myself clear. my regards

@@adelabdelshafik thanks alot dear prof 🌹

@@hamedabuhuryra8349 welcome

Welcome, glade you find it useful.

@@adelabdelshafik Having a good teacher is a valued privilege sir. I and many others like me value your painstaking efforts. Please keep spreading the knowledge to us all. Thanks again!

Thanks, glade you find it useful.

OK. Will do

@@adelabdelshafik Make a video on JCC

ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-JK33j_pUp9I.html

When you apply a cylinder with its axis at 180 degrees, the effect of this cylinder will appear at 90 degrees

Would watch the video on other device, The sound level is average, would you check again and let me know.

@@adelabdelshafik ok sir