Question 2 PLease !!!! A thin lens is made from a refracting material with index

Question

Question 2 PLease !!!!

A thin lens is made from a refracting material with index of refraction 1.7 and is immersed in air. The lens is convex on the left face with radius of curvature 8cm. The lens is concave on the right face with radius of curvature -14cm. What is the focal length of the lens? The critical angle for total internal reflection when going from quartz glass into air is 43.23 degree. Find the index of refraction of quartz glass. Predict the speed of light in quartz glass material. Assume that quartz glass has no magnetic properties (mu = mu_0) and predict the electric permittivity of quartz glass.

Explanation / Answer

from lens maker's equation

1/f = (n-1)*(1/R1 -1/R2)

1/f = (1.7-1) *(1/8 - 1/14)

f = 26.7 cm <<<-----answer

3)

sinc = (nair/nmed)

C = critical angle

sin42.43 = 1/nglass

nglass = 1.482   <<<----------answer

b)

speed v = c/n = 3*10^8/1.482 = 2.02*10^8 m/s

(c)

v = 1/sqrt(u*e)

2.02*10^8 = 1/sqrt(e*4*pi*10^-7)

epsilon = 1.95*10^-11

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