- 1(current)
Q. No.Consider sunlight incident on a slit of width \(10^{4}~\mathring{A}.\) The image seen through the slit shall:
| 1. | be a fine sharp slit white in colour at the centre |
| 2. | a bright slit white at the centre diffusing to zero intensities at the edges |
| 3. | a bright slit white at the centre diffusing to regions of different colours |
| 4. | only be a diffused slit white in colour |
Subtopic: Â Diffraction |
Level 4: Below 35%
Hints
Light of wavelength \(\lambda\) falls perpendicularly onto a single slit of width \(d\). A diffraction maximum is formed at \(P\) on a faraway screen placed parallel to plane of the slit. The first diffraction minimum is formed at \(Q,\) as shown on the screen. Let \(C\) be a 'point' so that it divides the slit \(AB\) in the ratio \(\dfrac{AC}{CB}=\dfrac12,\) i.e. \(AC\) represents the upper \(\dfrac13^{rd}\) of the slit. The total amplitude of the oscillation arriving from \(AC\) at \(Q\) is \(A_1\) and from \(CB\) at \(Q\) is \(A_2\).
Then:
1. \(2 A_{1}=A_{2}\)
2. \(A_{1}=2 A_{2}\)
3. \(\sqrt{2} A_{1}=A_{2}\)
4. \(A_{1}=A_{2}\)
Then:
1. \(2 A_{1}=A_{2}\)
2. \(A_{1}=2 A_{2}\)
3. \(\sqrt{2} A_{1}=A_{2}\)
4. \(A_{1}=A_{2}\)
Subtopic: Â Diffraction |
Level 3: 35%-60%
Hints
Consider sunlight incident on a pinhole of width \(10^{3}~\mathring{{A}}\). 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 |
Choose the correct option from the given ones:
| 1. | (a) and (c) only |
| 2. | (a) and (d) only |
| 3. | (b) and (d) only |
| 4. | (b) and (c) only |
Subtopic: Â Diffraction |
Level 3: 35%-60%
Hints
Consider a parallel beam of monochromatic light of wavelength \(600~\text{nm}.\) It is allowed to pass through a slit of width \(0.15~\text{mm}.\) Assume that the angles involved are very small. The angular divergence in which most of the light gets diffracted will be:
1. \(4\times 10^{-3}~\text{rad}\)
2. \(2.0\times10^{-3}~\text{rad}\)
3. \(8.0\times10^{-3}~\text{rad}\)
4. \(90^\circ\)
1. \(4\times 10^{-3}~\text{rad}\)
2. \(2.0\times10^{-3}~\text{rad}\)
3. \(8.0\times10^{-3}~\text{rad}\)
4. \(90^\circ\)
Subtopic: Â Diffraction |
Level 3: 35%-60%
Hints
Which of the following colourful patterns is due to the diffraction of light?
1. Rainbow
2. White light dispersed using a prism
3. Colours observed on compact disc
4. Blue colour of the sky
1. Rainbow
2. White light dispersed using a prism
3. Colours observed on compact disc
4. Blue colour of the sky
Subtopic: Â Diffraction |
Level 3: 35%-60%
Please attempt this question first.
Hints
Please attempt this question first.
Consider the diffraction of light through a rectangular slit which is twice as wide as it is high. Which of the following statements is true?
| 1. | The central diffraction peak is wider in the vertical direction than in the horizontal direction. |
| 2. | The central diffraction peak is wider in the horizontal direction than in the vertical direction. |
| 3. | The central diffraction peak is equally wide in both horizontal and vertical directions. |
| 4. | The width of the central diffraction peak is independent of the wavelength of light used. |
Subtopic: Â Diffraction |
 55%
Level 3: 35%-60%
Please attempt this question first.
Hints
Please attempt this question first.
A parallel beam of light of wavelength \(\lambda=400~\text{nm}\) falls normally onto a single slit of width \(d=0.2~\text{mm},\) placed in front of a screen which is \(50~\text{cm}\) away. The first maximum, next to the central maximum, is formed on the screen at a distance of:
| 1. | \(0.5~\text{mm}\) | 2. | \(1~\text{mm}\) |
| 3. | \(1.5~\text{mm}\) | 4. | \(2~\text{mm}\) |
Subtopic: Â Diffraction |
Level 3: 35%-60%
Hints
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 |
Choose the correct option from the given ones:
| 1. | (a) and (b) only | 2. | (a) and (c) only |
| 3. | (b) and (d) only | 4. | (c) and (d) only |
Subtopic: Â Diffraction |
 58%
Level 3: 35%-60%
Hints
- 1(current)
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