A light beam is made to pass through two separate tissues A and B having refractive index 1.25 and 2 respectively. If the length of both the tissues are same and equal to 4 m. The ratio of time taken by the light beam travelling through the tissue B with respect to the tissue A is

Q. A laser light beam passes through water and oil as shown below. If the time taken by the laser to pass through water is t, then the time taken by the same light beam in oil would be _______.​

Q. Time taken by the impulse to travel through atria, AV node and the rest of conducting tissue is -

Q. Light of wavelength 630 nm in vacuum, falling normally on a biological specimen of thickness 10 $\mu$m, splits into two beams that are polarized at right angles. The refractive index of the tissue for the two polarizations are 1.32 and 1.333. When the two beams emerge, they are out of phase by

Q. A tissue with a refractive index 1.33 is introduced in one of the light paths of a Michelson interferometer operating with a monochromatic coherent light source of wavelength $589\text{nm}$. After the introduction of a tissue sample of thickness $\Delta t$. the fringe pattern is observed to shift by 50 fringes. If thickness is 2 $\Delta t$, the fringe pattern will shift by

Q. Light travels through a glass plate of thickness $t$ and having a refractive index $\mu$. If $c$ is the velocity of light in vacuum, the time taken by light to travel this thickness of glass is