1) In a double-slit experiment, light rays from the two slits that reach the sec
ID: 1382374 • Letter: 1
Question
1) In a double-slit experiment, light rays from the two slits that reach the second maxima on one side of the central maxima, travel distances that differ by
?/2
4?
2?
?
?/4
2) Young's slit experiment is done first in air and then repeated with the whole apparatus unchanged except it is immersed in water. Do the fringes on the screen
Go further apart
Stay the same
Go closer together
3) The information on a DVD is encoded via bits of information in "hills and valleys" and read with optical light. Which color light do you think would allow for the highest bit density?
Red
Color does not matter
Blue
Yellow
Thank You
Explanation / Answer
1) 2*lamda
Becuase , for nth bright fringe, path difference,
d*sin(theta) = n*lamda
for second bright fringe, d*sin(theta) = 2*lamda
2) Go closer together
becuase, fringe widh, beta = lamda*R/d
lamda ---> wave length
R---> distance between screen ald slits
d---> slit separation
in water lamda decreases so beta also decreases.
3) Color does not matter
Intesnity does not depend on color
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