In order to increase the separation between bright fringes on the screen of a Yo

Question

In order to increase the separation between bright fringes on the screen of a Young's double slit apparatus, what must you do? decrease the distance from slits to screen increase the slit separation decrease the slit separation decrease the wavelength Monochromatic light is incident on a soap film (n=1.4) from air (n=1.0). What is the appearance of the film in reflected light as the thickness of the film approaches zero? bright (a maximum) dark (a minimum) intermediate intensity (not near a maximum or a minimum)

Explanation / Answer

Number 4)

The formula that governs this is y/L = m(wavelength)/d

Thus you can increas wavelength, reduce the slit separation, or increase the distance from screen to slits.

Only Choice B is one of those options.

Number 5)

The formula that applies is 2nt = m(wavelength)

As n approcahes zero, the reflected wavelength approaches zero, so that means you see nothing.

Seeing nothing means a dark area (a minimum) Choice B

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