Good Afternoon, i am currently studing to become a optical technician by mail and i was wondering if yous could help me answer a question.
A lens has a focal length in one meridian of +25cm and at right angles to this meridian a focal length of +50 cm.
What is the power of this lens along its principle merdian's?
A sphero-cylindrical lens +2.50 D.S/-2.00 D.C x V is made up in glass of refractive index 1.52. What are the radii of curvature of the spherical and cylindrical surfaces?
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