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5
MCQ (Single Correct Answer)

Figure shows a standard two slit arrangement with slits $S_1, S_2, P_1, P_2$ are the two minima points on either side of $P$ (figure).

At $P_2$ on the screen, there is a hole and behind $P_2$ is a second 2-slit arrangement with slits $S_3, S_4$ and a second screen behind them.

A
There would be no interference pattern on the second screen but it would be lighted
B
The second screen would be totally dark
C
There would be a single bright point on the second screen
D
There would be a regular two slit pattern on the second screen
6
MCQ (Multiple Correct Answer)

Two sources $S_1$ and $S_2$ of intensity $I_1$ and $I_2$ are placed in front of a screen [Fig. (a)]. The pattern of intensity distribution seen in the central portion is given by Fig. (b).

In this case, which of the following statements are true?

A
$S_1$ and $S_2$ have the same intensities
B
$S_1$ and $S_2$ have a constant phase difference
C
$S_1$ and $S_2$ have the same phase
D
$S_1$ and $S_2$ have the same wavelength
7
MCQ (Multiple Correct Answer)

Consider sunlight incident on a pinhole of width $10^3 \mathop A\limits^o$. The image of the pinhole seen on a screen shall be

A
a sharp white ring
B
different from a geometrical image
C
a diffused central spot, white in colour
D
diffused coloured region around a sharp central white spot
8
MCQ (Multiple Correct Answer)

Consider the diffraction pattern for a small pinhole. As the size of the hole is increased

A
the size decreases
B
the intensity increases
C
the size increases
D
the intensity decreases
9
MCQ (Multiple Correct Answer)

For light diverging from a point source,

A
the wavefront is spherical
B
the intensity decreases in proportion to the distance squared
C
the wavefront is parabolic
D
the intensity at the wavefront does not depend on the distance
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