In the given figure, a wavefront AB moving in air is incident on a plane glass surface XY, Its position CD after refraction through a glass slab is showin in gigure. The ratio of width of wavefront AB to the refracted wavefront CD is

In the adjoining figure, a wavefront AB moving in air is incident on a plane glass surface XY. Its position CD, after refraction through a glass slab is shown also along with the normals drawn at A and D. The refractive index of glass with respect to air will be equal to

A wave front AB moving in air is incident on a plane glass surface. XY , as given in the figure, its position CD after refraction through glass slab is shown along with normal drawn at A and D. the refractive index of glass w.r.t air is given by

A beam of light is incident on a water surface of angle of incidence 60^(@) and R.I. of water is 4/3. The ratio of width of incident wavefront to refracted wavefront is

A monochromatic light of wavelength 4800 A travelling in air is incident on a glass slab of refractive index 1.5, its wavelenght in glass slab is

A monochromatic light of wavelength 4800 A travelling in air is incident on a glass slab of refractive index 1.5, its wavelenght in glass slab is

A parallel beam of light travelling in water is incident obliquely on a glass surface. After refraction its width ………………….