True or False: When light waves interfere, constructive interference leads to an

Question

True or False: When light waves interfere, constructive interference leads to an increase in brightness and destructive interference to a decrease in brightness.

True of False: The double-slit experiment uses the interference of coherent waves from two slits to create an interference pattern of alternating bright and dark fringes.

True of False: Visible light passes through a hole of diameter 150nm in sheet of metal and falls on a distant screen. If the metal is heated, making the hole larger, the size of the central bright spot on the screen gets smaller.

True of False: Light passes through two small parallel slits and leaves an interference pattern on a distant screen. If the two slits are now moved closer to each other, the bright fringes on the screen will also move closer to each other.

Explanation / Answer

here,

a)

this is true ,

when the interference is constructive , the intensity of lights are added and the brightness is increased

b)

yes , this is also true

The double-slit experiment uses the interference of coherent waves from two slits to create an interference pattern of alternating bright and dark fringes

c)

the size of the spot depends on the hole size by formula

y = lamda * D/d

where d is the slit width

when the d is incresed, then the y is decreased

so this is also TRUE

d)

this is false,

it also depends on

y = lamda * D/d

therefore when slits comes closer,

d is decreased then the bright fringe moves far from each other and y increases

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