Physical Optics-Diffraction [IAS (Admin.) Mains Physics]: Questions 1 - 5 of 16

Choose Programs:

📹 Video Course 2024 (300 Lectures [199 hrs : 9 mins]): Offline Support

Rs. 1230.00 -OR-

1 Month Validity (Multiple Devices)

Preview All LecturesDetails

🎓 Study Material (549 Notes): 2024-2025 Syllabus

Rs. 600.00 -OR-

3 Year Validity (Multiple Devices)

Topic-wise Notes & SampleDetails

🎯 544 Questions (& PYQs) with Full Explanations (2024-2025 Exam)

Rs. 1000.00 -OR-

3 Year Validity (Multiple Devices)

CoverageDetailsSample Explanation

Help me Choose & Register (Watch Video) Already Subscribed?

Question 1

Appeared in Year: 2007

Describe in Detail Subjective▾

The radius of the first zone in a zone plate is . What will be the position of the first image of a point source of light of light of wavelength placed at a distance of from the zone plate.

Edit

Explanation

For , the radius of the zone, the relation can be written as

is the distance of the source from the zone plate and is the distance of screen from th…

… (154 more equations) …

Question 2

Appeared in Year: 2007

Describe in Detail Subjective▾

Define resolving power and dispersive power of a grating. Two spectral lines of wavelength and are seen clearly resolved in the second order spectral of a grating. If the grating has line per cm, what should be the minimum width of the grating?

Edit

Explanation

  • Dispersive power of a grating: It is defined as the radio of the radio of the difference in the angle of diffraction of any two neighboring spectral lines to the difference in wavelength between the two spectral lines. It can also be defined as the difference in the angle of diffraction per unit change in wavelength. The diffraction of the

… (450 more equations) …

Question 3

Appeared in Year: 2018

Describe in Detail Subjective▾

2 Derive Bragg diffraction law for X-ray diffraction compare lave and Debye-Scherer methods for crystal structure determination. (Paper-2)

Edit

Explanation

In 1912, W. H Bragg put forward a model which generates the conditions for diffraction in a very simple way. They pointed that a crystal may be divided into various sets of parallel planes. The directions of diffraction lines can then be accounted for if X- rays are considered to be reflected by such a set of parallel atomic planes followed by the …

… (575 more words, 1 figure) …

Question 4

Appeared in Year: 2017

Describe in Detail Subjective▾

Explain with proper example the interferences to ‘division of wave front’ and ‘division of amplitude’ .

(Paper - 1)

Edit

Explanation

The phase relation between the waves emitted by two independent light sources rapidly charges with time and therefore they can never be coherent, through the sources are identical in all respects. However, if two sources are derived from a single source by some device, then any phase change occurring in one source is simultaneously accompanied by t…

… (229 more words) …

Question 5

Appeared in Year: 2005

Describe in Detail Subjective▾

What is the essential difference between interference and diffraction of light? How can you achieve Fraunhofer diffraction in the laboratory? Using the concept of Fraunhofer diffraction at a single slit, find out the intensity distribution produced by two slit of equal width.

Edit

Explanation

The main differences between interference and diffraction are as follows:

Table Shows Difference between Interference & Diffraction
InterferenceDiffraction
(1) Interference is the result of interaction of light coming from different wave fronts.(1) Diffraction is the result of interaction of light coming from different parts of the same wave front.

… (762 more equations, 15 figures) …