SET UP AND SOLVE The center of curvature of the first surface is on the incoming

Question

SET UP AND SOLVE The center of curvature of the first surface is on the incoming side of the light, so R1 is negative: R1=20cm. The center of curvature of the second surface is on the outgoing side of the light, so R2 is positive: R2=5.0cm. Then, 1ff===(n1)(1R11R2)(1.521)(120cm15cm)7.7cm REFLECT This lens is a diverging lens—a negative lens—with a negative focal length. Part A - Practice Problem: A double-concave lens with index of refraction n=1.47 has two surfaces with radii of curvature with absolute values 12.5 cm and 10.5 cm . What is the focal length of the lens?

Explanation / Answer

1/f= (1.47 -1 )/(1/(-12.5) - 1/10.5) == 0.47*( -0.08 -0.095)= -0.08225
1/f = -0.08225
f= -12.16 cm

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