A soap film of thickness 0.0011 mm appears dark when seen by reflected light of wavelength `5800Å`. What is the refractive index of soap solution if it is between 1.2 and 1.5. `[mu = 1.318]`

A soap flim of thickness 0.3 mu m appears dark when seen by the refracted light of wavelength 580 nm . What is the index of refraction of the soap sloution, if it is known to be between 1.3 and 1.5 ?

Find the minimum thcknessof a film which will strongly reflect the light of wavelength 589 nm. The refractive index of the material of the film is 1.25.

Light of wavelength 6000 Å in air enters a medium of refractive index 1.5. What will be its wavelength in the medium ?

What is the minimum thickness of a soap bubble needed for constructive interference in reflected light if the light incident on the film has wavelengths 900 nm ? Assume the refractive index for the film is mu = 1.5

What is the minimum thickness of a soap bubble needed for constructive interference in reflected light, if the light incident on the film is 750 nm? Assume that the refractive index for the film is n=1.33

When light is incident on a soap film of thickness 5 xx 10^(-5)cm , wavelength which is maximum reflected in the visible region is 5320Å . The refractive index of the film will be :

In Young's double slit experiment the slits, S_(1) & S_(2) are illuminated by a parallel beam of light of wavelength 4000 Å from the medium of refractive index n_(1)=1.2 A thin film of thickness 1.2 mum and refractive index n=1.5 is placed infrom of S_(1) perpedicular to path of light. the refractive index of medium between plane of slits & screen is n_(2)=1.4 if the light coming from the film and S_(1)&S_(2) have equal intensities I then intensity at geometrical centre of the screen O is