A beam of light of wavelength 6400 Å is incident normally on a parallel glass plate of 5cm thick and R.I. 1.6. The beam takes the same time to travel from source to incident surface and through the glass plate. The distance of source from incident surface is

A beam of light of wavelength 6400 overset (@)(A) is incident normally on a parallel glass plate of 5cm thick and R.I 1.6 . The beam takes the same to travel from source to incident surface and through the glass plate . The distance of source from incident surface is

A ray of light is incident normally on a glass slab of thickness 5 cm and refractive index 1.6. The time taken to travel by a ray from source to surface of slab is same as to travel through glass slab. The distance of source from the surface is

A ray of light is incident normally on a glass slab of thickness 5 cm and refractive index 1.6. The time taken to travel by a ray from source to surface of slab is same as to travel through glass slab. The distance of source from the surface is

A ray of light is incident normally on a glass slab of thickness 5 cm and refractive index 1.6. The time taken to travel by a ray from source to surface of slab is same as to travel through glass slab. The distance of source from the surface is

A parallel beam of light of intensity I_@ is incident on a coated glass plate. If 25% of the incident light is reflected from the upper surface and 50% of light is reflected from the lower surface of the glass plate, the ratio of maximum to minimum intensity in the interference region of the reflected light is

A beam of light is incident at the polarizing angle of 35^(@) on a certain glass plate. The refractive index of the glass plate is:

White light is incident normally on a thin glass plate of refractive index 1.5. Calculate the minimum thickness of the film for which the wavelength 4200 Å is absent for the reflected light.