Question

What is speed of light in air, glass, water

Answer 1

HI.

QUESTION ➡ WHAT IS SPEED OF LIGHT IN AIR, GLASS, WATER ❓

ANSWER ➡

FIRST OF ALL,

WHAT IS SPEED?

==> SPEED IS THE RATIO OF DISTANCE PER UNIT TIME OR THE DISTANCE TRAVELLED BY THE BODY PER UNIT TIME.

NOW,

SPEED OF LIGHT IN AIR = 3 X 108 m/sec

SPEED OF LIGHT IN GLASS = 2 X 108 m/sec

AND,

SPEED OF LIGHT IN WATER = 225000 km/sec

HOPE IT HELPS YOU

Answer 2

aNg=3/2 aNg=Va/Vg where aNg=Refractive index of light in glass. Va=velocity in air=3×(10power8),Vg=velocity in glass, therefore 3/2=Va/Vg 3/2=3×(10power8)/Vg Vg=3×(10power8)×2/3 Vg=2×(10power8)meter/second thus we find the velocity of light in water, Vw=2.25×(10power8)meter/second