11. c.
Four equidistant slits of the same width are made one above the other on an opaque sheet & illuminated by a monochromatic parallel beam of light perpendicular to the sheet.Point P & Q are on the screen directly in front of the lowest slit & the slit just above the lowest slit respectively.At point P the path difference between the topmost and lowermost slit is 4.5 λ .The intensity created at P by a single slit is Io.
1.The intensity of light at P is
(A)Io (B)2Io (C)4Io (D)none of these
2.The intensity of light at Q is
(A)Io (B)2Io (C)4Io (D)none of these
3.If the width of th lowest slit is made four times the original then the new intensity at P is
(A)Io (B)2Io (C)4Io (D)none of these
4.If the width of th lowest slit is made four times the original then the new intensity at Q is
(A)Io (B)2Io (C)4Io (D)none of these
5.If a 5th similar slit is made below the lowermost slit the new intensity at P is ??
6.If a 5th similar slit is made below the lowermost slit the new intensity at Q is ??
7.If a 5th similar slit is made at equal distance(as between other slits) above the topmost slit the new intensity at P is ??
8. If a 5th similar slit is made at equal distance(as between other slits) above the topmost slit the new intensity at Q is ??
9.If two similar slits are made at the same distance(as between other slits)above the 1st slit and below the 4th slit respectively & sheets of thickness t1,t2,....,t6 and ref.index μ1,μ2,....,μ6 are placed over each of the 6 slits , the new intensity at P is ??
10. If two similar slits are made at the same distance(as between other slits)above the 1st slit and below the 4th slit respectively & sheets of thickness t1,t2,....,t6 and ref.index μ1,μ2,....,μ6 are placed over each of the 6 slits , the new intensity at Q is ??
If you feel that there is some mistake or some necessary information missing in ques.5 - 10 plz. let me know(as I have thought of these variations myself)
Also,Plz. post any other possible variations that come to your mind , which will be useful to all !!
-
UP 0 DOWN 0 0 8
8 Answers
12 ka bhi c hi lagra .... not sure tho .... nahi banaye....
[ab aur mood ni hai :( ]
33
__________________________________
1.
For 1 path diff is given 4.5λ=3dsinθ=3d(3d/D)=9d2/D
d2/D=4.5/9=0.5λ
for 2 Δx=2d(2d/D)=4d2/D=4(0.5λ)=2λ
for 3 Δx=d(d/D)=0.5λ
for straight one. Δx=0
now 2 and 4th are in phase and 1 and 3 out of phase.. so
net intensity is zero at P..
________________________________
33well Rkrish bhai... bata to diya karo.. sahi hai ya galat...