I know the fact that virtual images are always upright and that plane mirrors always form virtual images. In a camera obscura, the light rays from the top and the bottom of the object cross at the pinhole and therefore the image formed on the opposite surface is upside down, but that is a real image. In a reflection of a fixed extended source on a plane mirror, the reflections of the incident rays coming from the top and the bottom of the object also cross at some point. Why we do not see an image turned upside down as we move farther away from the mirror than this point at which the reflected rays cross?

  • $\begingroup$ Try drawing a diagram of the rays from an object reflecting in a plane mirror, remembering that the angle of reflection equals the angle of incidence. $\endgroup$ – S. McGrew May 12 at 23:51

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Browse other questions tagged or ask your own question.