Answer Happy

The figure below shows how a double-slit interference pattern is
produced on a screen for monochromatic light.
1) In terms of the wavelength of the light λ, what is
the value for the path difference x =
r1 – r2 if at the point P
on the screen there is a dark region (and no other dark
region between O and P)?
Select one:
a.λ/2
b.λ
c.3λ/2
d.2λ
2) In terms of the wavelength of the light λ, what is
the value for the path difference x =
r1 – r2 if at the point P
on the screen there is a dark region (and no other dark region
between O and P)?
Select one:
a.λ/2
b.λ
c.3λ/2
d.2λ
3) Suppose there is a bright fringe at P. Would this bright
fringe move closer to O, move further away, or be unchanged, if the
separation, d, of the slits was reduced?
Select one:
a. remain unhanged
b. move further from O
c. move closer to O
4) Suppose there is a bright fringe at P. Would this
bright fringe move closer to O, move further away, or be unchanged,
if the red light was made more intense?
Select one:
a. remain unhanged
b. move further from O
c. move closer to O
5) Suppose there is a bright fringe at P. Would this
bright fringe move closer to O, move further away, or be unchanged,
if the red light was replaced with blue light?
Select one:
a. remain unhanged
b. move further from O
c. move closer to O
14-16 T Screen Wavefront of mono- chromatic light -D