A resonator is formed by a convex mirror of radius R1=-1 m and a concave mirror of radius R2=1.5 m. What is the maximum possible mirror separation if this is to remain a stable resonator?

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Connection formulae for WKB approximation

In quantum mechanics, Schrödinger’s equation for certain systems with varying parameters cannot be solved directly. In such a case, an approximation method is used to obtain the approximate solution. WKB method is a special technique used to obtain the approximate solution for Schrödinger’s time-independent equation. In general, the WKB method is used to solve linear differential equations with varying coefficients. This method is called semiclassical approximation in quantum mechanics.