A mono chromatic light passes through a glass slab (`mu`=1.5) of thickness 9cm in time `t_1` .If it takes a time `t_2` to travel the same distance through water (`mu`=(4)/(3)) .The value of (`t_1`-`t_2`)

A monochromatic light passes through a glass slab (mu = (3)/(2)) of thickness 90 cm in time t_(1) . If it takes a time t_(2) to travel the same distance through water (mu = (4)/(3)) . The value of (t_(1) - t_(2)) is

A monochromatic light passes through a glass slab (mu = (3)/(2)) of thickness 90 cm in time t_(1) . If it takes a time t_(2) to travel the same distance through water (mu = (4)/(3)) . The value of (t_(1) - t_(2)) is

The refractive index of glass is 1.9 . If light travels through a glass slab of thickness d in time t and takes the same time to travel through a transparent beaker filled with water upto a level of 1.5 d, then the refractive index of water is

A ray of light passes normally through a slab (mu=1.5) of thickness t. If the speed of light in vacuum be C, then time taken by the ray to go across the slab will be

The time taken by a ray of light to travel through a glass slab of thickness 2 cm and refractive index 1.5 will be