Wave Optics-II Physics Test Series NEET 2020

Test Preparation on Wave Optics-II-Physics Test Series For NEET 2020

1.

A thin plastic sheet of refractive index 1.6 is used to cover one of slits o a double slit arrangement. The central point on the screen is now occupied by what would have been the 7th bright fringe before the plastic was used. If the wavelength of light is 600 nm, what is the thickness (in um ) of the plastic

17
24
38
46

2.

In a certain double slit experimental arrangement interference fringes of width 1.0 mm each are observed when light of wavelength 5000 A is used. Keeping the set up unaltered, if the source is replaced by another source of wavelength 6000 A, the fringe width will be

10.5 mm
21.0 mm
31.2 mm
41.5 mm

3.

A mixture of light, consisting of wavelength 590 nm and an unknown wavelength, illuminates Young's double slit and gives rise to two overlapping interference patterns on the screen. The central maximum of both lights coincide. Further, it is observed that the third bright fringe of known light coincides with the 4th bright fringe of the unknown light. From this data, the wavelength of the unknown light is

1393.4 nm
2885.0 nm
3442.5 nm
4776.8 nm

4.

In a double slit experiment, the two slits are 1mm apart and the screen is placed 1m away. A monochromatic light 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

10.1mm
20.5mm
30.02mm
40.2mm

5.

The maximum intensity of fringes in Young's experiment is I. If one of the slit is closed, then the intensity at that place becomes I o. Which of the following relation is true

1I = Io
2I = 2Io
3I = 4Io
4There is no relation between I and Io

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