Решение на момент правки #17967 от , автор JustABeast. Это не текущая версия.
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Statement

13.1.13. Determine the focal length of a spherical mirror of radius of curvature R.

Solution

For problem $13.1.13$
For problem
For problem $13.1.13$
For problem

Here it was used that h' = 0, no matter what the original h value is. Since the incident height does not change where the ray converges.

Answer

[R/2]