What is the reason for twinkling of stars ?

A Dispersion of light
B Total internal reflection
C Atmospheric reflection
D Atmospheric refraction

Correct Answer: Atmospheric refraction

Atmospheric refraction is the reason behind the twinkling of stars.The starlight on entering earth surface undergoes refraction continuously before it reaches to earth. The starlight bend towards the normal as it enters from rarer to denser medium. The air near the earth surface is denser than upper layers. Therefore the apparent position of the stars are slightly different from its actual position, when it is viewed from horizon.The apparent position of stars are not stationary and keeps on changing slightly, because the physical condition of the atmosphere are not stationary.Because of this the stars sometimes appears brighter and sometimes appear fainter.
Bissoy MCQ
#General Knowledge #Physics

Related Questions

The theory behind stars twinkling is that
A The refractive index of the different layers of earth's atmosphere changes continuously, consequently the position of the star's image changes with time
B The intensity of light emitted by them changes with time
C The light from the star is scattered by the dust particles and air molecules in the earth's atmosphere
D The distance of the stars from the earth changes with time
Twinkling of stars is due to
A large distance of stars and storms in air
B rotation of earth
C large size of stars
D large distance of stars and fluctuations in the density of air
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A Cosmic stars
B Quasars
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A discovery
B perception
C quest
D enquiry
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A perception
B discovery
C enquiry
D quest
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A Scattering of light by atmosphere
B Reflection of light by atmosphere
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Neither the moon nor the stars --- visible last night. The verb to fill in the gap should be ---
A was
B were
C are
D had been
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A Oceans
B Plants
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Identify the error from the quotation words in the following sentence : 'There are' 'as many' 100 million 'stars' 'in' the Milky Way. No Error.
A There are
B as many
C stars
D in
Translation into bangla : ' his stars are now in the ascendant '.
A তার এখন নাকে তেল দিয়ে ঘুমানোর কথা
B তার এখন শিরে সংক্রান্তি অবস্থা
C এখন তার একাদশে বৃহস্পতি
D এখন সে আকাশ ভরা তারা

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