If the refractive index of water is 4/3 and that of given slab of glass immersed in it is 5/3. What is the critical angle for a ray of light tending to go from glass to water?
(a) sin-1\(\left(\cfrac34\right)\)
(b) sin-1\(\left(\cfrac35\right)\)
(c) sin-1\(\left(\cfrac45\right)\)
(d) Data given are insufficient to make any calculation