Physics Numerical

[5riti]

Light of wavelength 500x10-9m in air enters a glass plate of refractive index 1.5. Find the speed and frequency of light in glass.

(Speed of light = 3x108ms-1)

Please,Can anyone solve this question I am stuck at it.
I'll be very thankful.

[mpkeshari]

Velocity = wavelength X frequency
3X100000000 = (500/1000000000)Xfrequency
Frequency = (3/500)X100000000000000000 = 6.0X100000000000000/s.
Refractive Index of glass = speed of light in air(vaccum)/speed of light in glass.
1.5 = 3X100000000/speed of light in glass
Speed of light in glass = 3X100000000/1.5 = 2.0 X 108 m/s

[5riti]

Velocity = wavelength X frequency
3X100000000 = (500/1000000000)Xfrequency
Frequency = (3/500)X100000000000000000 = 6.0X100000000000000/s.
Refractive Index of glass = speed of light in air(vaccum)/speed of light in glass.
1.5 = 3X100000000/speed of light in glass
Speed of light in glass = 3X100000000/1.5 = 2.0 X 108 m/s

Thanks.