A thin film is `4,000 overset @A` thick. White light from an extended source falls normally on the film.If the refractive index of film is 1.5,what wavelength within the visible spectrum will be intenisifed in the reflected beam ,if visible range of the spectrum is `3,900 overset @A` to `7,800 overset @A`?

A light of wavelength 6,000 overset @A in air, enters a medium with refractive index 1.5.What will be frequency and wavelength of light in the medium?

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.

A glass prism of refractive index 1.5 is immersed in water (mu= 4//3) . A light beam normally on the face AB is totally reflected to reach on the face BC if .

White light may be considred to have lambda from 4,000 overset @A to 7,500 overset @A .If an oil film has thickness 10^(-4) cm,deduce the wavelength in the visible refion for which the reflection alog the normal direction will be strong.Take mu of the oil as 1.4.

White light may be considred to have lambda from 4000 overset @A to 7500 overset @A .If an oil film has thickness 10^(-4) cm, deduce the wavelength in the visible region for which the reflection along the normal direction will be Weak Take mu of the oil as 1.4.

The light of wavelength 6,000 overset @A falls normally on a slit odf width 2 mm.Calculate the linear width of central mximum on a screen kept 4 m away from teh slit.

A beam of ligth consisting of two wavelength 4,800 overset@A and 6,000 overset@A is used to obtain interfernce fringes in a double slit experiment.The distnce between the slits is 1.8 mm and the distance of screen from the plane of slits is 1.2 m Find the distance of the third bright frings on the screen from the central maximum for the wavelength 6,000 overset @A .

Lenses are often coated with a thin film to reduce the intesntiy of reflected light. If the index of refraction of the coating is 1.3 ,what is the smallest thickness that wilo give minimum relfaction of yello light (lambda=5,800 overset@A) ?

Using light of wavelength 6,000 overset@A ,it is found that in a thin film of air,7 fringes occur between two points,deduce the difference of the film thickness between these points.

A soap flm of refractinve index 4//3 is illuminated by white light incident at an angle 45^@ .The transmitted length is examined in a spectroscope and a brigth band is found to be at 6,000 overset @A .Find the minimum thickness of the film.