One face of prism of refracting angle `30^@` and refractive index `1.414` is silvered.
Channel: Doubtnut
Date: 2020-08-02

One face of prism of refracting angle `30^@` and refractive index `1.414` is silvered. At what angle must a ray of light fall on the unsilvered face so that it retraces its path out of the prism ?