Free Printable Interference

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Interference

Total questions: 25

Worksheet time: 43mins

Name

Class

Date

What's happening at A?

Two crests are combining to create constructive interference.

A crest and a trough are combining to create destructive interference.

Two crests are combining to create destructive interference.

A crest and trough are combining to create constructive interference.

Which of the following does not describe two waves "in phase"

Waves that overlap with crest on trough and trough on crest

Waves that overlap with trough on trough and crest on crest

Waves that completely overlap

Waves that constructively interfere with each other

Interference of light is evidence that:

the speed of light is very large

light is a transverse wave

light is electromagnetic in character

light is a wave phenomenon

In a Young's double-slit experiment, the slit separation is doubled. To maintain the same fringe spacing on the screen, the screen-to-slit distance D must be changed to:

D/2

D $\sqrt{2}$

For destructive interference, the path difference is:

odd number of half wavelengths

even number of half wavelengths

whole number of wavelengths

even whole number of wavelengths

Constructive interference happens when two waves are:

out of phase.

zero amplitude.

in phase.

All of these

Two light sources are said to be coherent if they

are of the same frequency.

are of the same frequency, and maintain a constant phase difference.

are of the same amplitude, and maintain a constant phase difference.

are of the same frequency and amplitude.

Fabry perot interferometer is a high resolving power instrument, which make use of the fringes of

equal inclination

equal thickness

equal chromatic order

equal coherence

In biprism when fringes are obtained by using white light, the central white fringe is known as____________ fringe.

first order

second order

nearest order

zeroth order

10.

The two parts of the same wave front travel through different paths and reunite on a screen to produce fringe pattern. This is known as interference due to division of ________

wavefront

amplitude

thickness

inclination

11.

In the biprism experiment the eyepiece is placed at a distance of 1.2 m from the source. The distance between the virtual sources was found to be $7.5\times10^4$ m. The wavelength of light, if the eyepiece is to be moved through a distance of 1.888 cm for 20 fringes will be,

$5890\ A\degree$

$5896\ A\degree$

$5900\ A\degree$

$5893\ A\degree$

12.

In Newton’s ring experiment the diameter of 15th ring was found to be $5.9\times10^{-3}$ m and that of 5th ring was $3.36\times10^{-3}$ m . If the radius of the plano-convex lens is 100 cm. The wave length of light used will be

$5910\ A\degree$

$5900\ A\degree$

$5890\ A\degree$

$5880\ A\degree$

13.

When one mirror of a Michelson Interferometer is moved a distance of 0.5 mm we observe 2000 fringes. What will be wavelength of light used?

$500\ nm$

$5000\ nm$

$500\ m$

$500\ \mu m$

14.

How do Michelson Interferometer produces a reflected and transmitted light beam from a monochromatic source?

by using He-Ne laser

by using semi silvered glass plate

by using two mirrors

by using two glass plates

15.

Why do you keep compensating plate in the path of the light ray?

to make light reflections

to make interference

to create path disturbance

to make path equal

16.

Widely used for determining the refractive indices of gases and liquids

Fabry Perot interferometer

Rayleigh refractometer

Abbe's refractometer

Twyman Green interferometer

17.

When a light wave is reflected from the surface of an optically denser medium, it suffers a phase change of _______ but it suffers no change in phase when reflected at the surface of optically rarer medium.

$2\pi$

$\pi$

$\frac{\pi}{2}$

$\frac{\pi}{4}$

18.

In Newton’s rings arrangement, why in reflected light the central spot is dark?

because path difference is integral multiple of wavelength.

because path difference is zero at point of contact.

because reflection from lens to air introduces extra path difference of $\frac{\lambda}{2}$

All the these

19.

The ratio of maximum to minimum intensity due to superposition of two wave is 49/9. then the ratio of the intensity of component waves is

$\frac{7}{3}$

$\frac{5}{2}$

$\frac{49}{9}$

$\frac{25}{4}$

20.

A soap bubble 250 nm thick is illuminated by white light. The refractive index of the soap film is 1.36. Which colour wavelength is not seen in the reflected light?

Red

Yellow

Green

Blue

21.

Haidinger's fringes are fringes of ........

equal thickness

equal inclination

equal width

equal radius

22.

In Michelson’s interferometer, concentric circular fringes are obtained when M₁ and M₂’ are _________ to each other

parallel

perpendicular

inclined

inclined at 45⁰

23.

Very small wavelength difference between very close spectral lines can be more accurately determined by __________

Michelson’s interferometer

spectrometer

F-P interferometer

telescope

24.

Additional path difference of ------ is introduced in ray while passing through glass plate of refractive index m.

$2\left(\mu-1\right)t$

$2\mu t$

$2\left(t-1\right)\mu$

$\mu\ t$

25.

What is the condition for the constructive interference of the thin film shown in figure above?

2t = mλ where m = 0,1,2,3,...

2nt = mλ where m = 0,1,2,3,...

2t = (m+½)λ where m = 0,1,2,3...

2nt = (m+½)λ where m = 0,1,2,3...

100 %

Interference

Total questions: 25

Worksheet time: 43mins

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