Physics Crash Course MHT-CET>Chapter 21 - Interference and Diffraction>Exercise 1>Q 17

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The equation of two light waves are $y_{1} = 6 \cos (ωt)$ and $y_{2} = 8 \cos (ωt + ϕ) .$ The ratio of maximum to minimum intensities produced by the superposition of these waves will be-

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Important Questions on Interference and Diffraction

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Physics Crash Course MHT-CET>Chapter 21 - Interference and Diffraction>Exercise 1>Q 18

Two light waves are given by,

E_{1} = 2 \sin (100 π t - k x + 30 °)

and

E_{2} = 3 \cos (200 π t - k x + 60 °) .

The ratio of intensity of first wave to that of second wave is -

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Physics Crash Course MHT-CET>Chapter 21 - Interference and Diffraction>Exercise 1>Q 19

If the ratio of the intensity of two coherent sources is

4

then the visibility

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

of the fringes is -

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Physics Crash Course MHT-CET>Chapter 21 - Interference and Diffraction>Exercise 1>Q 20

One important similarity between light waves and sound waves is that both -

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Physics Crash Course MHT-CET>Chapter 21 - Interference and Diffraction>Exercise 1>Q 21

Two waves

y_{1} = A_{1} \sin (ω t - β_{1})

and

y_{2} = A_{2} \sin (ω t - β_{2})

superimpose to form a resultant wave whose amplitude is

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Physics Crash Course MHT-CET>Chapter 21 - Interference and Diffraction>Exercise 1>Q 22

Two waves originating from source

S_{1}

and

S_{2}

having zero phase difference and common wavelength

λ

will show completely destructive interference at a point

P

if

(S_{1} P - S_{2} P)

is

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Physics Crash Course MHT-CET>Chapter 21 - Interference and Diffraction>Exercise 1>Q 23

Two light rays having the same wavelength in vacuum are in phase initially. Then, the first ray travels a path

L_{l}

through a medium of refractive index

μ_{1}

while the second ray travels a path

L_{2}

through a medium of refractive index

μ_{2}

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

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Physics Crash Course MHT-CET>Chapter 21 - Interference and Diffraction>Exercise 1>Q 24

LASER is a

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Physics Crash Course MHT-CET>Chapter 21 - Interference and Diffraction>Exercise 1>Q 25

A wave of light of __________ wavelength is called monochromatic light.