This question for all brainly genius user .Q.N .speed of light in vacum 3*10^8 m/s when light inter into the glass than its velocity is decrease I.e 2*10^8 and after the refraction is obtain same speed in vacuum during this it accelerates when coming out from the glass so that it required some energy so who who is give this energy???
Answers
Answer:
Explanation:
The speed of light in vacuum, commonly denoted c, is a universal physical constant
important in many areas of physics. Its precise value is 299792458 metres per second
(approximately 3.00×108
m/s), since the length of the metre is defined from this constant
and the international standard for time.
[1] According to special relativity, c is the
maximum speed at which all matter and information in the universe can travel. It is the
speed at which all massless particles and changes of the associated fields (including
electromagnetic radiation such as light and gravitational waves) travel in vacuum. Such
particles and waves travel at c regardless of the motion of the source or the inertial
reference frame of the observer. In the theory of relativity, c interrelates space and time,
and also appears in the famous equation of mass–energy equivalence E = mc
2
.
[2]
Speed of light
Sunlight takes about 8 minutes 17 seconds to travel the average
distance from the surface of the Sun to the Earth.
Exact values
metres per second 299792458
Planck length per Planck time
(i.e., Planck units) 1
Approximate values (to three significant digits)
kilometres per hour 1080 million (1.08×109
)
miles per second 186000
miles per hour 671 million (6.71×108
)