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When light from a monochromatic source is incident on a single narrow slit, it gets diffracted and a pattern of ahem ate bright and dark fringes is obtained on screen, called "Diffraction Pattern" of single slit. ln diffraction pattern of single slit, it is found that.

1. Central bright fringe is of maximum intensity and the intensity of any secondary bright fringe decreases with increase in its order.
2. Central bright fringe is twice as wide as any other secondary bright or dark fringe.

1. A single slit of width $0.1\ mm$ is illuminated by a parallel beam oftight of wavelength $6000\mathring{\text{A}}$ and diffraction bands are observed on a screen $0.5\ m$ from the slit. The distance of the third dark band from the central bright band is:

1. Should be $\frac{\lambda}{2}$, where $\lambda$, is the wavelength.
2. Should be of the order of wavelength.
3. Has no relation to wavelength.
4. Should be much larger than the wavelength.
5. To observe diffraction, the size of the obstacle.
6. Bands disappear
7. Bands become broader and farther apart
8. No change will take place
9. Diffraction bands become narrower and crowded together.
10. A diffraction pattem is obtained by using a beam of red light. What will happen, if the red light is replaced by the blue light?
11. $6 \times 10^{-3}$ rad
12. $4 \times 10^{-3}$ rad
13. $2.4 \times 10^{-3}$ rad
14. $4.5 \times 10^{-3}$ rad
15. Light of wavelength $600\ nm$ is incident normally on a slit of width $0.2mm$. The angular width of central maxima in the diffraction pattern is $($measured from minimum to minimum$).$
16. $10^{-1}m$
17. $10^{-2}m$
18. $2 \times 10^{-2}m$
19. $2 \times 10^{-1}m$
20. ln Fraunhofer diffraction pattern, slit width is $0.2\ mm$ and screen is at $2\ m$ away from the lens. If wavelength of tight used is $5000\mathring{\text{A}}$ then the distance between the first minimum on either side the central maximum is:
21. $3\ mm$
22. $1.5\ mm$
23. $9\ mm$
24. $4.5\ mm$