A soap film of thickness 00011 mm appears dark when seen by the reflected light of wavelength 580 nm.. What is the index of refraction of the soap solution, if it is known to be between 1-2 and 1.5 ?

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 ?

Soap film of thickness 1 mu m appears bright when seen through reflected light of wavelength 700 nm. What should be the index of refraction of soap solution if it is somewhere between 1.2 and 1.3 ?

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 ?

With a thin air film between two points, 6 fringes appear when light of wavelength 5890 Å is used. Calculate the difference in the thickness of the film between the two points.

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