Ask a Doubt
Request a call back

Join NOW to get access to exclusive study material for best results

CBSE Class 10 Answered

why does the star twinkle at night and not during the day?
Asked by Athik Shetty | 17 Jan, 2014, 06:57: PM
answered-by-expert Expert Answer
Starlight travels through the many layers of the Earth 's atmosphere before it reaches to our eye. Light coming from star gets refracted many times in random directions in atmosphere. Thus image of star appears somewhat displaced from its actual position. Since, atmosphere has both cold and hot air and by changing width of these layers of air light ray bends less or more. So, image of star appears changing its position. This is twinkling of star.

Stars closer to the horizon appear to twinkle more than stars that are overhead - this is because the light of stars near the horizon has to travel through more air than the light of stars overhead and so is subject to more refraction.

Stars would not appear to twinkle if we viewed them from outer space.

During day time the sky is so bright beacuse of scattering of sun light. Therefore stars can not be see twikling during day time.

 


Answered by Komal Parmar | 19 Jan, 2014, 03:36: PM

Application Videos

Concept Videos

Multiple Choice Questions Practice Test
Answered Unanswered My Questions My Answers
CBSE 10 - Physics
what type of image produced by plane mirror
Asked by agankitgupta938 | 18 Apr, 2024, 04:29: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Physics
how is light made
Asked by infinityupgraded | 13 Apr, 2024, 08:17: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Physics
what are the ray diagrams??
Asked by suryamr2019 | 08 Mar, 2024, 04:32: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Physics
student observes the above phenomenon in the lab as a white light passes through a prism. Among many other colours, he observed the position of the two colours Red and Violet. What is the phenomenon called? What is the reason for the violet light to bend more than the red light?
Asked by saurabhjd527 | 30 Jan, 2024, 07:55: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Physics
If rays are coming from a different object to adouble convex lens with two different refractive indices Mu1 and Mu 2 above and below the principal axis, explain how many images will be seen?
question image
Asked by subrasixty | 13 Jan, 2024, 05:05: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Physics
Is object distance always negative in both lens and mirrors?
Asked by nandanagnair | 17 Dec, 2023, 03:44: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Physics
The image of a candle flame placed at a distance of 30 cm from a spherical lens is formed on a screen placed at a distance of 60 cm from the lens. If the height of the flame is 2.4 cm,find the height of its image 
Asked by namish1088 | 16 Nov, 2023, 08:09: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Physics
describe the refraction taking place in the rainbow formation  
Asked by 0 0 | 19 Oct, 2023, 03:51: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Physics
what is the magnification of the image when v=30 cm and u= 15cm
Asked by bubbynaik77 | 29 Sep, 2023, 09:34: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Physics
what is defination of light
Asked by gurcharansingh37306 | 10 Sep, 2023, 12:53: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
My Class Videos Tests ₹ Plans Ask a Doubt
Get Latest Study Material for Academic year 24-25 Click here
×