A beam of monochromatic light passes through two glass slabs of the same geometrical thickness at normal incidence. The refractive index of the first slab is 1.5 and that of the second. 2.0. The ratio of the time of passage of the beam throw, the first to the second slab is

1. 0.75

Q. Two transparent slabs have the same thickness as shown. One is made of material A of refractive index 1.5. The other is made up of two materials B and C with thickness in the ratio 1:2. The refractive index of C is 1.6. If a monochromatic parallel beam passing through the slabs has the same number of waves inside both, the refractive index of B is

Q. Two transparent slabs have the same thickness as shown. One is made of material A of refractive index 1.5. The other is made of two materials B and C with thickness in the ratio $1:2$. The refractive index of C is 1.6. If a monochromatic parallel beam passing through the slabs has the same number of waves inside both, then

Q. Two transparent slabs have the same thickness as shown in figure. One is made pf material $A$ of refractive index $1.5$. The other is made of two materials $B$ and $C$ with thickness in the ratio $1:2$. The refractive index of $C$ is $1.6$. If a monochromatic parallel beam passing through the slabs has the same number of wavelengths inside both, the refractive index of $B$ is

Q. When the same monochromatic ray of light travels through glass slab and through water, the number of waves in glass slab of thickness $6cm$ is same as in water column of height $7cm$. If refractive index of glass is $1.5$ then refractive index of water is :

Q. A ray of light takes ${10}^{-19}$ second to cross a glass slab of refractive index $1.5$. The thickness of the slab will be