Gamma Question Bank for Medical Physics>Chapter 27 - Wave Optics>Assigment>Q 26

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Oil floating on water looks coloured due to interference of light. What should be the order of magnitude of the thickness of oil layer in order that this effect may be observed?

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Important Questions on Wave Optics

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Gamma Question Bank for Medical Physics>Chapter 27 - Wave Optics>Assigment>Q 27

When white light is incident normally on an oil film of thickness

10^{- 4} cm

and refractive index

1.4

then the wavelength which will not be seen in the reflected system of light is

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Gamma Question Bank for Medical Physics>Chapter 27 - Wave Optics>Assigment>Q 28

Imperfections in optical lenses can be observed with the help of

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Gamma Question Bank for Medical Physics>Chapter 27 - Wave Optics>Assigment>Q 29

Two light rays having the same wavelength

λ

in vacuum are in phase initially. Then, the first ray travels a path

L_{1}

through a medium of refractive index

n_{1}

while the second ray travels a path of length

L_{2}

through a medium of refractive index

n_{2}

. The two waves are then combined to produce interference. The phase difference between the two waves is

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Gamma Question Bank for Medical Physics>Chapter 27 - Wave Optics>Assigment>Q 30

Two coherent sources of intensity ratio

β

interfere, then the value of

\frac{(I_{\max} - I_{\min})}{(I_{\max} + I_{\min})}

is

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Gamma Question Bank for Medical Physics>Chapter 27 - Wave Optics>Assigment>Q 31

In a double slit experiment to find the separation between slits by displacement method, the separations of images of slits were found to be

16 mm

and

9 mm

respectively. The actual separation between slits will be

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Gamma Question Bank for Medical Physics>Chapter 27 - Wave Optics>Assigment>Q 32

A double slit experiment is performed with light of wavelength

500 n m

. A thin film of thickness

2 m m

and refractive index

1.5

is introduced in the path of the upper beam. The location of the central maximum will

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Gamma Question Bank for Medical Physics>Chapter 27 - Wave Optics>Assigment>Q 33

To observe diffraction, the size of the obstacle

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Gamma Question Bank for Medical Physics>Chapter 27 - Wave Optics>Assigment>Q 34

In Fraunhofer diffraction from a single slit, wave front incident on the slit is