please can you help :hammer:
I'm currently stuck on a couple of questions
A -5.00D lenses is to be made in glass of refractive index 1.802, using tools calibrated for glass of refractive index 1.523. The tool marked +3.50 is used to work the front surface. Assuming that the tools step in 0.12D intervals, what tool would be selected to work the back surface?
Next:hammer:
A spherical generator is used to produce a -15.00Dsurface on glass of refractive index 1.80. The diameter of the cutting tool is 80mm and the radius of the cutting surface is 4mm. What is the angle between the axis of the tool and the axis of the lens?
I hope you can see my dilemma!!
Thanx Nicola :o
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