Two wavelengths of light, λ 1 = 4500 A o and λ 2 = 6000 A o are sent through a Young's double-slit apparatus simultaneously. Then:

the third order bright fringe of λ 2 will coincide with fourth order bright fringe of λ 1 .

no interference pattern will be formed.

the third order bright fringe of λ 1 will coincide with the fourth order bright fringe of λ 2 .

the fringes of wavelength λ 1 will be wider than the fringes of wavelength λ 2 .

E M B I B E

Achieve CUET (UG) Physics Practice Book>Chapter 10 - Wave Optics>Exercise>Q 47

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In Young's double slit experiment maximum intensity of light is $I_{\max}$ , what is the intensity when path difference is $\frac{λ}{2}$ ?

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Important Questions on Wave Optics

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Achieve CUET (UG) Physics Practice Book>Chapter 10 - Wave Optics>Exercise>Q 48

Thin oil films on water show brilliant colours. This is due to

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Achieve CUET (UG) Physics Practice Book>Chapter 10 - Wave Optics>Exercise>Q 49

In double slit experiment, a glass plate of refractive index 1.5 of thickness t is introduced in to path of one of the interfering beams of wavelength λ. The position of central maxima has got shifted by

\frac{2 λ D}{d} \cdot

Then, what would be the thickness of plate ?

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Achieve CUET (UG) Physics Practice Book>Chapter 10 - Wave Optics>Exercise>Q 50

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

2 m

and the distance between the slits is

0.5 mm

. If wavelength of the monochromatic source of light being used is

6000 Å

, then distance between the fringes will be

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Achieve CUET (UG) Physics Practice Book>Chapter 10 - Wave Optics>Exercise>Q 51

If the two slits in Young's double-slit experiment, are of unequal width, then

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Achieve CUET (UG) Physics Practice Book>Chapter 10 - Wave Optics>Exercise>Q 52

A double-slit apparatus is set up and green light is used to form the interference pattern. The green light is then replaced by red light. Which of the following changes may not allow the spacing of the bright bands on the screen to remain unaffected by the change of light colour? (Given that the distance between the slits is $d$ and that between the plane of the slits and the screen is $D$ .)

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Achieve CUET (UG) Physics Practice Book>Chapter 10 - Wave Optics>Exercise>Q 53

For demonstration of interference, we require two sources which emits radiations of -

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Achieve CUET (UG) Physics Practice Book>Chapter 10 - Wave Optics>Exercise>Q 54

Monochromatic source of light is used in Young's double slit experiment. Shape of interference fringes on the screen will be -

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