JEE Physics Online Test Wave Optics Set E

1.

2. In a double slit experiment, the two slits are 1 mm apart and the screen is placed 1 m away. A monochromatic light of wavelength 500 nm is used. What will be the width of each slit for obtaining ten maxima of double slit within the central maxima of single slit pattern?

3. Diameter of human eye lens is 2 mm. What will be the minimum distance between two points to resolve them, which are situated at a distance of 50 m from eye. The wavelength of light is 5000 Å?

4. In a Fraunhofer diffraction at a single slit of width d with incident light of wavelength 5500 Å, the first minimum is observed at angle of 30°. The first secondary maximum is observed at an angle q, equal to

5. Light of wavelength l is incident on a slit of width 'd'. The resulting diffraction pattern is observed on a screen at a distance D. The linear width of the principal maximum is then equal to the width of the slit if D equals

6. When the angle of incidence is 60° on the surface of a glass slab, it is found that the reflected ray is completely polarised. The velocity of light in glass is

7. Two polaroids are kept crossed to each other. Now one of them is rotated through an angle of 45°. The percentage of incident light now transmitted through the system is

8. Waves that cannot be polarised are

9. A beam of light strickes a piece of glass at an angle of incidence of 60° and the reflected beam is completely plane polarised. The refractive index of the glass is

10.

11. A slit 5 cm wide is irradiated normally with micro waves of wavelength 1 cm. Then the angular spread of the central maximum on either side of the incident light is nearly

12.

13. If a thin mica sheet of thickness 't' and refractive index 'm' is placed in the path of one of the waves producing interference, then the whole interference pattern shifts towards the side of the sheet by a distance

14. In an interference pattern by two identical slits, the intensity of central maxima is I. What will be the intensity of the same spot, if one of the slits is closed?

15. In Young's experiment when sodium light of wave length 5893 Å is used, then 62 fringes are seen in the field of view. Instead, if violet light of wavelength 4350 Å is used, then the number of fringes that will be seen in the field of view will be

16. In Young's double slit experiment carried out with light of wavelength 5000 Å, the distance between the slit is 0.2 mm and the screen is at 200 cm from the plane of slits. The central maximum is at x = 0. The third maximum will be at x equal to

17. In an interference experiment monochromatic light is replaced by white light, we will see

18.

19. Two coherent monochromatic light beams of intensities I and 4I are superimposed; the maximum and minimum possible intensitites in the resulting beam are

20.

21. Colours appear on a thin soap film and on soap bubbles due to the phenomenon of

22. In a Fresnel biprism experiment, the two positions of lens give separation between the slits as 16 cm and 9 cm respectively. What is the actual distance of separation?

23. In Young's double-slit experiment, if the distance between the slits is halved and the distance between the slits and the screen is doubled, the fringe width becomes

24.

25. For a wavelength of light 'l' and scattering object of size 'a', all wavelengths are scattered nearly equally, if