Concept explainers
The refractive index of the lens material when it has two convex surfaces of radii of curvature 34.1 cm and focal length 28.9 cm.
Answer to Problem 67P
Solution:
The refractive index is 1.59.
Explanation of Solution
Formula used:
Lens maker’s formula where f is the focal length, r1 is the radius of curvature of first surfce and r2 is radius of curvature (RoC)of second surface of the lens, positve when in the direction of optical path, otherwise negative. n is the refractive index of the lens material.
Calculation:
Thus, using lens maker’s formula,
This gives, n=1.59
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