A concave mirror has a radius of curvature of 34.0 cm. (b) If the mirror is immersed in water (refractive index 1.33), what is its focal length?

Video transcript

Welcome back, everyone. We are making observations about a concave spherical mirror. We are told that it has a radius R and it is held in a transparent liquid medium of a refractive index N. And we are tasked with calculating the focal length of the mirror in the liquid medium. Well, the image formation by the mirror is determined by the law of reflection and that is unaffected by the medium or the refractive index. So N is not going to appear in our formula. The focal length of a mirror placed in any transparent medium medium is related to the radius of curvature by our focal length equal to R over two. So the focal length of the mirror held in the liquid transparent parent medium is going to be R over two which corresponds to our final answer. Choice of B. Thank you all so much for watching. I hope this video helped. We will see you all in the next one.