hello..... i have a student who is doing the DO course and I had graduated DO course about 10 years ago. I have forgotten all the formulas. Not sure how to explain or show the student.
Here is the questions:
- What is the sag of this surface over a diameter of 60mm?
- A pencil of light is made to converge to a point 20cm beyond a lens. Find the curvature of the wavefront:
a) on leaving the lens
b) 1cm from the lens,
c) 19.9cm from the lens
d) 21cm from the lens.
some guidance and help would be great.
Thank you.
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