Light of wavelength 6000Å is incident on a thin glass plate of refractive index 1.5 such that angle of refraction into the plate is `60^(@)`. Calculate the smallest thickness of plate which will make it appear dark by reflection.

Light of wavelength 6000A is incident on a thin glass plate of refractive index 0.5 such that angle of refraction into plate is 60° .calculate the thickness of plate which will make it appear dark by reflection?

Light of wavelength 3000A is incident on a thin glass plate of refractive index 1.5 such that angle of refraction into plate is 60° .calculate the thickness of plate which will make it appear dark by reflection?

Light of wavelength 12000A is incident on a thin glass plate of refractive index 1.5 such that angle of refraction into plate is 60° .calculate the thickness of plate which will make it appear dark by reflection?

Light of wavelength 24000A is incident on a thin glass plate of refractive index 1.5 such that angle of refraction into plate is 60° .calculate the thickness of plate which will make it appear dark by reflection?

Light of wavelength 12000A is incident on a thin glass plate of refractive index 0.5 such that angle of refraction into plate is 60° .calculate the thickness of plate which will make it appear dark by reflection?

Light of wavelength 3000A is incident on a thin glass plate of refractive index 0.5 such that angle of refraction into plate is 60° .calculate the thickness of plate which will make it appear dark by reflection?

Light of wavelength 12000A is incident on a thin glass plate of refractive index 1 such that angle of refraction into plate is 60° .calculate the thickness of plate which will make it appear dark by reflection?

Light of wavelength 24000A is incident on a thin glass plate of refractive index 1 such that angle of refraction into plate is 60° .calculate the thickness of plate which will make it appear dark by reflection?

Light of wavelength 3000A is incident on a thin glass plate of refractive index 1 such that angle of refraction into plate is 60° .calculate the thickness of plate which will make it appear dark by reflection?

Light of wavelength 6,000 overset @A is incident on a thin film of refractive index 1.5 ,such that angle of refraction into the film in 60^@ .Calculate the smallest thickness of the film,which will make it appear dark by reflection.