A ray of light passes from air to water to glass to air. Given that the refractive index for light passing from air to water is (frac{4}{3}) and air to glass is (frac{3}{2}), calculate the refractive index of glass relative to water
-
A.
0.50 -
B.
0.67 -
C.
0.75 -
D.
1.13
Correct Answer: Option D
Explanation
(_{g} eta _{w} = frac{ _g eta _a}{ _a eta _w})
= (frac{3}{2} times frac{1}{frac{4}{3}})
= (frac{3}{2} times frac{3}{4})
= (frac{9}{8})
= 1.125
= 1.13 (to 2 d.p)