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Physics Part-II
Class 12
NCERT
1
Chapter 1: Ray Optics and Optical Instruments
41 questions
2
Chapter 2: Wave Optics
30 questions
Q1
Two towers on top of two hills are 40 km apart. The line joining them passes 50 m above a hill halfway between the towers. What is the longest wavelength of radio waves, which can be sent between the towers without appreciable diffraction effects?
Q2
A parallel beam of light of wavelength 500 nm falls on a narrow slit and the resulting diffraction pattern is observed on a screen 1 m away. It is observed that the first imum is at a distance of 2.5 mm from the centre of the screen. Find the width of the slit.
Q3
Answer the following questions:
(a) When a low flying aircraft passes overhead, we sometimes notice a slight shaking of the picture on our TV screen. Suggest a possible explanation.
(b) As you have learnt in the text, the principle of linear superposition of wave displacement is basic to understanding intensity distributions in diffraction and interference patterns. What is the justification of this principle?
3
Chapter 3: Dual Nature of Radiation and Matter
44 questions
4
Chapter 4: Atoms
23 questions
5
Chapter 5: Nuclei
38 questions
6
Chapter 6: Semiconductor Electronics: Materials, Devices and Simple Circuits
25 questions
Question
Easy
Solving time: 4 mins
A parallel beam of light of wavelength 500 nm falls on a narrow slit and the resulting diffraction pattern is observed on a screen 1 m away. It is observed that the first imum is at a distance of 2.5 mm from the centre of the screen. Find the width of the slit.
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Text solution
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Wavelength of light beam,
Distance of the screen from the slit,
For first minima,
Distance between the slits is
Distance of the first minimum from the centre of the screen can be obtained as,
Now,
Therefore, the width of the slits is 0.2 mm.
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Practice more questions from Physics Part-II (NCERT)
Q1
Two towers on top of two hills are 40 km apart. The line joining them passes 50 m above a hill halfway between the towers. What is the longest wavelength of radio waves, which can be sent between the towers without appreciable diffraction effects?
Q2
A parallel beam of light of wavelength 500 nm falls on a narrow slit and the resulting diffraction pattern is observed on a screen 1 m away. It is observed that the first imum is at a distance of 2.5 mm from the centre of the screen. Find the width of the slit.
Q3
Answer the following questions:
(a) When a low flying aircraft passes overhead, we sometimes notice a slight shaking of the picture on our TV screen. Suggest a possible explanation.
(b) As you have learnt in the text, the principle of linear superposition of wave displacement is basic to understanding intensity distributions in diffraction and interference patterns. What is the justification of this principle?
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| Question Text | A parallel beam of light of wavelength 500 nm falls on a narrow slit and the resulting diffraction pattern is observed on a screen 1 m away. It is observed that the first imum is at a distance of 2.5 mm from the centre of the screen. Find the width of the slit. |
| Updated On | Mar 5, 2023 |
| Topic | Wave Optics |
| Subject | Physics |
| Class | Class 12 |
| Answer Type | Text solution:1 Video solution: 1 |
| Upvotes | 110 |
| Avg. Video Duration | 9 min |
