Question

Two beams of coherent light travel different paths, arriving at point P. If the maximum destructive interference is to occur at point P, what should be the path difference between the two waves?

The path difference between the two waves should be one and one-quarter of a wavelengths.
The path difference between the two waves should be two wavelengths.
The path difference between the two waves should be one-half of a wavelength.
The path difference between the two waves should be one wavelength.
The path difference between the two waves should be one-quarter of a wavelength.
The path difference between the two waves should be four wavelengths

Answer 1

@Mashy would this be 1 wavelength

Answer 2

we just discussed..

what does 1 wavelength path difference give you?? i just told you taht in the previous post :O :O!!

Answer 3

wait so the center would be 0.5 and then 1 would be 1 ? then, I am trying to picture this I guess its not happening

Answer 4

this is what you said
it can't be zero.. zero -> central bright 0.5 --> first dark 1 -- > first bright 1.5---> second dark 2---> second bright and so on.. get it :D

Answer 5

so would this be two then?

Answer 6

no thats wrong too =(

Answer 7

zero path difference ---> central bright (constructive)

0.5 path difference ----> 1st dark (destructive)

1 path difference ----> 1st bright (constructive)

1.5 path difference ----> 2nd dark (destructive)

2 path difference ----> 2nd bright (constructive)

2.5 path difference ----> 3rd dark (destructive)

3 parth difference ----> 3rd bright (constructive)


phew!!.. left side are all in terms of wavelengths..
THIS SHOULD GIVE YOU THE ANSWER .. O.O

Answer 8

1.5 wavelength

Answer 9

that is a very helpful chart I will write it down, thank you very much mashy...I hope I got that now did I ?

Answer 10

but for the answers it states one and one quarter not one half

Answer 11

yes yes

phew :P :P..

infact.. you can even make a formula

see the pattern

Construction = Integral multiples of wavelength = n(wavelength) where n =0,1,2,3...
destruction = (n/2 +1)(wavelength) where n = 0,1,2,3.. etc

Answer 12

its 1 and half..

Answer 13

one and one quarter is wrong o.O

Answer 14

but there is no one and one half

Answer 15

i am a bad reader and so bad with physics, is this it -- The path difference between the two waves should be one-half of a wavelength.

Answer 16

hahaha.. yea.. use spects :P..

Answer 17

lol the sad thing is that they are on =P

Answer 18

haha ok ok.. fine.. now rest you should be able to answer if its on interference itself

Answer 19

thank you , i hope so can I post more please =)

Answer 20

ok