Question

A contact lens is made of plastic with an index of repraction of 1.5 , The lens has an outer radius of eurvature ( convex) of 2 cm and an inner radius of curvature (concave ) of 4 cm .the focal length of the lens is;

Jul 21, 2012

1/F=(n-1) • (1/R1-1/R2)=
=(1.5-1) • (1/0.02-1/0.04)=
=0.5• (50-25)=12.5
F=0.08 m

Jul 21, 2012

Related Questions

A converging thin lens made out of crown glass (n=1.52) has a focal length f=1.0m An identical lens... The convex meniscus lens has a 15cm radius for the convex surface and 20cm for the concave surface.... 3) Find out the Focal length for the following lenses (in all cases, the lens is made of a glass wit...