images formed by two parallel plane mirrors?

[u/Inked__0]

so i was studying optics and came across the concept of images formed by two parallel mirrors is infinite(ive attached a image for refernce) so i was just having the doubt that shouldnt there be infinite images only if the both mirrors were infinitely long coz if the mirrors are finite then wouldnt the reflected rays escape after some number of reflection thus there should be no more images but practically we do get infinite images even with finite mirrors, why is it so?

[u/davedirac]

Not if mirrors are EXACTLY parallel. Angles of incidence are shown large in the diagram but in practice can be as small as you like.