Physics Crash Course NEET>Chapter 18 - Wave Optics>Level 1>Q 35

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A mixture of Yellow light of wavelength $580 nm$ and blue light of wave length $450 nm$ is incident normally on an air film of thickness $2.9 \times 10^{-4} \mathrm{~mm}$. The colour of reflected light is

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Important Questions on Wave Optics

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Physics Crash Course NEET>Chapter 18 - Wave Optics>Level 1>Q 36

In Young’s double slit experiment, the central point on the screen is,

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Physics Crash Course NEET>Chapter 18 - Wave Optics>Level 1>Q 37

In Young's double slit experiment, the two slits are illuminated by light of wavelength

5890

Å

and the angular distance between the fringes obtained on the screen is

{0.2}^{o}

. If the whole apparatus is immersed in water then the angular fringe width will be, if the refractive index of water is

\frac{4}{3}

.

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Physics Crash Course NEET>Chapter 18 - Wave Optics>Level 1>Q 38

In Young's double-slit experiment, the distance between slits and screen is

2 m

and distance between slits is

0.25 mm

. A light of wavelength

800 nm

is used to find fringes on the screen. If the screen moves with a speed of

5 m s^{- 1}

, then first maxima will move with a speed of:

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Physics Crash Course NEET>Chapter 18 - Wave Optics>Level 1>Q 39

The distance between two coherent sources is

1 mm

. The screen is placed at a distance of

1 m

from the sources. If the distance of the third bright fringe is

1.2 mm

from the central fringe, the wavelength of light used is

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Physics Crash Course NEET>Chapter 18 - Wave Optics>Level 1>Q 40

Interference fringes were produced in Young's double slit experiment using light of wavelength

6000 Å .

When a transparent film of thickness

3 \times 10^{- 3} cm

was placed over one of the slits, the fringe pattern is shifted by a distance equal to

20

fringe widths. The refractive index of the material of the film is

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Physics Crash Course NEET>Chapter 18 - Wave Optics>Level 1>Q 41

In Young's double slit experiment, instead of taking slits of equal width, one slit is made twice as wide as the other. Then, in the interference pattern,

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Physics Crash Course NEET>Chapter 18 - Wave Optics>Level 1>Q 42

In Young's double-slit experiment, the distance between the slits and the screen is

1.2 m

and the distance between the two slits is

2.4 mm

. If a thin transparent mica sheet of thickness

1 μm

and refractive index

1.5

is introduced between one of the interfering beams, the shift in the position of the central bright fringe is

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Physics Crash Course NEET>Chapter 18 - Wave Optics>Level 1>Q 43

Which of the following is wrong for interference fringes?