We have a beam of light with its potential source and destination in the denser medium such as a fiber optic cable. If the critical angle of the medium is $60$ degrees, answer the following questions.

a$.$ If the angel of incident is $50$ degrees, can the beam reach its

destination $($give the reason for your answer$)?$

b$.$ If the angel of incident is $70$ degrees, can the beam reach its

destination $($give the reason for your answer$)?$