Wave Optics's Question 1 | Physics XII - Part 2 | NCERT Exemplar Questions

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MCQ (Single Correct Answer)

Consider a light beam incident from air to a glass slab at Brewster's angle as shown in figure.

A polaroid is placed in the path of the emergent ray at point $P$ and rotated about an axis passing through the centre and perpendicular to the plane of the polaroid.

For a particular orientation, there shall be darkness as observed through the polaroid

The intensity of light as seen through the polaroid shall be independent of the rotation

The intensity of light as seen through the polaroid shall go through a minimum but not zero for two orientations of the polaroid

The intensity of light as seen through the polaroid shall go through a minimum for four orientations of the polaroid

MCQ (Single Correct Answer)

Consider sunlight incident on a slit of width $10^4 \mathop A\limits^o$. The image seen through the slit shall

be a fine sharp slit white in colour at the centre

a bright slit white at the centre diffusing to zero intensities at the edges

a bright slit white at the centre diffusing to regions of different colours

only be a diffused slit white in colour

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