Answer
Verified
390.3k+ views
Hint: In this question first of all we will define refraction of light and then atmospheric refraction. Then we will give the explanation how the twinkling occurs in stars but not in planets.
Refraction of light: - The bending light rays when it passes from one medium to another medium with different optical density is known as refraction of light.
Atmospheric refraction: - The phenomenon of refraction in the atmosphere due variable optical densities of gases present in the atmosphere is called atmospheric refraction.
Twinkling of star: The phenomenon of twinkling of stars is due to the atmospheric refraction of light rays coming from the stars.
The light coming from the stars keeps on refracting from entering the atmosphere of earth until reaching the surface of earth. Atmospheric refraction occurs only when the refractive index of medium is continuously changing. Atmosphere bends the light rays towards the normal that is why the real position of stars is different from the apparent position that appeared to us.
The apparent position of the star keeps on changing because of the variation in optical density of the atmosphere.
Since the stars are very far away from the earth surface. They are considered to be a point source and the position of these point sources keep on deflecting which appear to us as a twinkling of stars. Sometimes stars appear brighter and sometimes they appear dim.
Why does the planet not twinkle?
Planets do not twinkle as the star does. This is because the planets are not so far away as the stars are. They are not considered to be point sources but they are considered as the collection of point sources of which the average deflection of light coming from them is zero.
Hence, option \[(C)\]is correct.
Note: - It is important to note that before answering this question we should be aware of refraction, atmospheric refraction.
Refraction of light: - The bending light rays when it passes from one medium to another medium with different optical density is known as refraction of light.
Atmospheric refraction: - The phenomenon of refraction in the atmosphere due variable optical densities of gases present in the atmosphere is called atmospheric refraction.
Twinkling of star: The phenomenon of twinkling of stars is due to the atmospheric refraction of light rays coming from the stars.
The light coming from the stars keeps on refracting from entering the atmosphere of earth until reaching the surface of earth. Atmospheric refraction occurs only when the refractive index of medium is continuously changing. Atmosphere bends the light rays towards the normal that is why the real position of stars is different from the apparent position that appeared to us.
The apparent position of the star keeps on changing because of the variation in optical density of the atmosphere.
Since the stars are very far away from the earth surface. They are considered to be a point source and the position of these point sources keep on deflecting which appear to us as a twinkling of stars. Sometimes stars appear brighter and sometimes they appear dim.
Why does the planet not twinkle?
Planets do not twinkle as the star does. This is because the planets are not so far away as the stars are. They are not considered to be point sources but they are considered as the collection of point sources of which the average deflection of light coming from them is zero.
Hence, option \[(C)\]is correct.
Note: - It is important to note that before answering this question we should be aware of refraction, atmospheric refraction.
Recently Updated Pages
Basicity of sulphurous acid and sulphuric acid are
Assertion The resistivity of a semiconductor increases class 13 physics CBSE
Three beakers labelled as A B and C each containing 25 mL of water were taken A small amount of NaOH anhydrous CuSO4 and NaCl were added to the beakers A B and C respectively It was observed that there was an increase in the temperature of the solutions contained in beakers A and B whereas in case of beaker C the temperature of the solution falls Which one of the following statements isarecorrect i In beakers A and B exothermic process has occurred ii In beakers A and B endothermic process has occurred iii In beaker C exothermic process has occurred iv In beaker C endothermic process has occurred
The branch of science which deals with nature and natural class 10 physics CBSE
What is the stopping potential when the metal with class 12 physics JEE_Main
The momentum of a photon is 2 times 10 16gm cmsec Its class 12 physics JEE_Main
Trending doubts
How do you solve x2 11x + 28 0 using the quadratic class 10 maths CBSE
Which type of bond is stronger ionic or covalent class 12 chemistry CBSE
What organs are located on the left side of your body class 11 biology CBSE
Difference between Prokaryotic cell and Eukaryotic class 11 biology CBSE
Difference Between Plant Cell and Animal Cell
How fast is 60 miles per hour in kilometres per ho class 10 maths CBSE
Fill the blanks with the suitable prepositions 1 The class 9 english CBSE
The Equation xxx + 2 is Satisfied when x is Equal to Class 10 Maths
When people say No pun intended what does that mea class 8 english CBSE