When light of wavelength `4000overset(o)(A)` in vacuum travels through the same thickness in air and vacuum the difference in the number of waves is one. Find the thickness (`mu_(air)` =1.0008).

When light of wavelength 5000 Å in vacuum travels through same thickness in glass and water, the difference in the number of waves is 400. Find thickness. (Refractive indices of glass and water are (3)/(2) and (4)/(3) respectively)

When light of wavelength 5000 Å in vacuum travels through same thickness in glass and water, the difference in the number of waves is 400. Find thickness. (Refractive indices of glass and water are (3)/(2) and (4)/(3) respectively)

When light of wavelength lambda_(0) in vacuum travels through same thickness ‘t’ in glass and water, the difference in the number of waves is. (Refractive indices ofglass and water are mu_(g) and mu_(w) respectively.)

When a sound wave travels through air, the air particles

When light travels through a medium from vacuum, its speed

Light travels -----km per second in air or vacuum.