I Angular stability of a Fabry–Pérot cavity

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Hello! I am designing a two-mirror cavity for an experiment. For the properties I need, I ended up using a 9.8 cm long cavity, with the 2 mirrors both having a 5 cm radius of curvature. Using Gaussian beam propagation formulas, I can easily compute most of the parameters I need (e.g., behavior with variation in length). However, I am not sure how to account for angular misalignments of the mirrors with respect to the axis connecting their centers. Is there a way to do this analytically (even approximately)? Even an order of magnitude estimate would be good. Thank you!
 
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Hi. I have got question as in title. How can idea of instantaneous dipole moment for atoms like, for example hydrogen be consistent with idea of orbitals? At my level of knowledge London dispersion forces are derived taking into account Bohr model of atom. But we know today that this model is not correct. If it would be correct I understand that at each time electron is at some point at radius at some angle and there is dipole moment at this time from nucleus to electron at orbit. But how...

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