a. Find the focal length of a biconvex lens with a radius of curvature of 30 cm
made of glass with a refractive index of 1.6. What is the optical power of the
lens?
b. One surface of a lens made of glass with a refractive index of 1.6 is flat,
the other is spherical. The optical power of the lens is 1 dptr. Determine the
radius of curvature of the spherical surface of the lens.