Concept explainers
The radius of the curvature of symmetric double convex lens with a focal length of 22 cm made from glass of refractive index 1.52.
Answer to Problem 69P
Solution:
Radius of curvature of the convex surfaces is 22.88 cm.
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:
As the lens is symmetric bi-convex thus,
Using, lens maker’s formula
This gives,
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