Stefan Bischof
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 Apr 23 reviewed Reviewed Does the angle of incidence change the refractive index? Apr 23 revised Water flow in salt solutions contemporary exposed to an electrical and constant magnetic field added tex and left content to author Apr 23 reviewed Reviewed Water flow in salt solutions contemporary exposed to an electrical and constant magnetic field Apr 23 suggested approved edit on Water flow in salt solutions contemporary exposed to an electrical and constant magnetic field Apr 19 comment Focal Length Calculation Your posted company Thorlabs has good online ressoures concerning working distance WC and focal length f. Post a separate question after studying these resources. Apr 19 comment Rain drop sliding on car windshield @Stealthmate Surface tension of water-glass surface determines contact angle to your windshield. Cleaning solvents will change this contact angle and area of contact. Apr 16 comment Focal Length Calculation You may select distance in parallel beam path arbitarly in geometric optics. Think about the lines in your diagram of a perfect parallel beam path: nothing will change the parallel lines until they refracted by a lens. Apr 16 comment Focal Length Calculation Improve your question by asking about a physics concept. You already learned focal length is related to making a perfect point source to a perfect parallel beam. Read about this geometric optics. Please feal free to ask specific questions about imperfect point sources - real sources. Apr 16 comment Focal Length Calculation +1 Yes, $f_2=d_5$. However I see from the sketch $d_1\neq d_{source}$ If it is also equal, than you are right. Apr 16 reviewed Reviewed Focal Length Calculation Apr 16 comment Focal Length Calculation +0 Welcome to physics SE! This question has no answer, if you do not define two things. a) $d_{source}\neq d_1$ and b) diverging angle $\theta_{source}$ which your laser may provide in its manual as an FWHM angle. Adding this information will earn you +1 Apr 6 reviewed No Action Needed Does a force do work on an object with constant velocity? Mar 22 comment Rain drop sliding on car windshield Surface pressure of the water-glas interface simplified to friction is neglected? Mar 19 reviewed Reviewed How does carbon dioxide or water vapour absorb thermal infra red radiation from the sun? Mar 17 revised Clarification from Griffiths Introduction to quantum mechanics hermitian, correct? and MathJax Mar 17 revised Clarification from Griffiths Introduction to quantum mechanics added MathJax Mar 17 comment Clarification from Griffiths Introduction to quantum mechanics +1 Welcome to Physics SE.. Mar 17 suggested approved edit on Clarification from Griffiths Introduction to quantum mechanics Mar 17 suggested approved edit on Clarification from Griffiths Introduction to quantum mechanics Mar 16 reviewed Reviewed $SU(2)$ symmetry and conservation law in condensed matter systems