Oil floating on water looks coloured due to interference of light.What should be the approximate thickness of the fiml jfor such effects to be visible?

To ensure almost 100 per cent transmitivity, photographic lenses are often coated with a thin layer of dielectric material. The refracive index of this material is intermediatead between that of air and glass (which makes the optical element of the lens). A typically used dielectric film is M_gF_2 (n=1.38). What should the thickness of the film be so that at the centre of the visible spectrum (5500 oversetcircA) there is maximum transmission.

Assertion : Sea water looks blue. Reason : Due to scatting of light by colloidal impurities present in sea water.

In these question, a statement of asertion followed by a statement of reason is given .Choose the correct answer out of the following choices: Assertion and reason both are correct statements and reason is correct explanation for assertion. Assertion and reason both are correct statements but reason is not correct explanation for assertion. Assertion is correct statement but reason is wrong statement. Assertion is wrong statement but reason is correct statement. Assertion:Thin films such as soap bubble or a thin layer of ol on water show beautiful colours,when illuminated by white light. Reason:It happens due to the interfernce of light reflected from the upper and lower surface ot the thin film.

What is the effect on the interference fringes in a Young's double slit experiment due to each of the following oerations? The monochromatic source is replaced by a source of white light.

What is the effect on the interference pattern in Young's double slit experiment due to each of the following operations? The widths of the slits are increased equally.

What is the effect on the interference fringes in a Young's double slit experiment due to each of the following oerations? The source is replced by nother source of shorter wavelength.

What is the effect on the interference fringes in a Young's double slit experiment due to each of the following oerations? The separtion betwen the two slits is decreased.

What is the effect on the interference pattern in Young's double slit experiment due to each of the following operations? The shole apparatus is kept in a denser medium.

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 beam of light consisting of two wavelengths, 650 nm and 520 nm,is used to obtain interference fringes in a Young experiment.-What is the least distance from the central maximum where the bright fringes due to both the wavelengths coincide?