Applied Optics Lecture N.4

Hey everybody, 

without much talk .. this is the forth applied optics lecture,

and it's about :

Ophthalmic Lenses
Optical Power of spectacle lens

Astigmatism, one of the eye's most common refractive errors. an eye with astigmatism receives a point as a an ellipse.

the lecture was given last week which means, it was on the 31st of October.

the lecture is really interesting .. 
hope you like it after my edits :)

if you have anything to say make a comment or something, make me feel the blog is alive not a ghost blog :)

anyway ..

don't forget to answer the Q's 

and study well

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