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Applied Physics 2: Diffraction
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Applied Physics 2: Diffraction
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25 Questions

1. If there are N number of slits in a grating spectra, then there will be how many secondary maximas?
2. What is the minimum number of lines per cm in a 2.5 cm wide grating spectrum which will just resolve two sodium lines (5890 Å and 5896 Å) in the first order spectrum?
3. Focal length of plane mirror is
4. The radius of curvature of a mirror is 20cm the focal length is
5. Convex lens focus a real, point sized image at focus, the object is placed
6. Light of 6000 Å is incident on a circular hole and is received on a screen 50 cm away. What is the radius of the hole, if the intensity of light on the screen is 4 times the intensity without the hole?
7. A concave mirror gives virtual, refract and enlarged image of the object but image of smaller size than the size of the object is
8. The following pattern was observed by a plane diffraction grating. How are the two images resolved?
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9. The radius of the half period zone is proportional to ___________
10. If the separation between the two slits in Double Slit Fraunhofer Diffraction is changed, what change will be observed in the diffraction pattern?
11. Light of 5000 Å is incident on a circular hole of radius 1 cm. How many half period zones are contained in the circle if the screen is placed at a distance of 1 m?
12. Light is incident normally on a grating of width 5 X 10-3 m with 2500 lines. What is the resolving power of the grating in the second order spectrum?
13. A grating has 16000 per inch over a length of 5 inches. What will be the smallest wavelength difference for a light of wavelength 6000 Å?
14. The unit of power of lens is
15. What is the relation between the dispersive power, D, of a grating and the order, n, of a spectrum?
16. The optical path of monochromatic light is the same if it travels 2 cm thickness of glass or 2.25 cm thickness of water. If the refractive index of water is 33, what is the refractive index of glass?
17. A beam of monochromatic light is incident on a plane transmission grating having 5000 lines/cm and the second order spectral line is found to be diffracted at 30°. The wavelength of the light is _______
18. The refractive index of glass is 1.5 and that of water is 1.3, the speed of light in water is 2.25 × 108 m/s. What is the speed of light in glass?
19. The speed of light in air is 3 × 108 m/s. If the refractive index of glass is 1.5, find the time taken by light to travel a distance of 10 cm in the glass.
20. Our eyes see two objects as separate, only if the angle subtended by them at the eye is greater than _________
21. Which among the following isn’t a suitable phenomenon to establish that light is wave motion?
22. The resolving power of a grating is directly proportional to grating constant.
23. Power of the lens is -40, its focal length is
24. A concave mirror gives real, inverted and same size image if the object is placed
25. If a light is incident on a grating with 5000 lines/cm, then the angular separation of the two lines (5000 Å and 5006 Å) in first order spectrum is ______

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