Wave Optics's Question 3 | Physics XII - Part 2 | NCERT Exemplar Questions

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MCQ (Single Correct Answer)

Consider a ray of light incident from air onto a slab of glass (refractive index $n$ ) of width $d$, at an angle $\theta$. The phase difference between the ray reflected by the top surface of the glass and the bottom surface is

$\frac{4 \pi d}{\lambda}\left(1-\frac{1}{n^2} \sin ^2 \theta\right)^{1 / 2}+\pi$

$\frac{4 \pi d}{\lambda}\left(1-\frac{1}{n^2} \sin ^2 \theta\right)^{1 / 2}$

$\frac{4 \pi d}{\lambda}\left(1-\frac{1}{n^2} \sin ^2 \theta\right)^{1 / 2}+\frac{\pi}{2}$

$\frac{4 \pi d}{\lambda}\left(1-\frac{1}{n^2} \sin ^2 \theta\right)^{1 / 2}+2 \pi$

MCQ (Single Correct Answer)

In a Young's double-slit experiment, the source is white light. One of the holes is covered by a red filter and another by a blue filter. In this case,

there shall be alternate interference patterns of red and blue

there shall be an interference pattern for red distinct from that for blue

there shall be no interference fringes

there shall be an interference pattern for red mixing with one for blue

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.

There would be no interference pattern on the second screen but it would be lighted

The second screen would be totally dark

There would be a single bright point on the second screen

There would be a regular two slit pattern on the second screen

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?

$S_1$ and $S_2$ have the same intensities

$S_1$ and $S_2$ have a constant phase difference

$S_1$ and $S_2$ have the same phase

$S_1$ and $S_2$ have the same wavelength

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 sharp white ring

different from a geometrical image

a diffused central spot, white in colour

diffused coloured region around a sharp central white spot

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