Light of wavelength 6400overset@A incident normally on a plane paralled glass slab thickness 5 cm and mu = 1.6. The beam takes the same time to travel from source to the incident surface as it takes to travel through the slab. The distance between the source and incident surface and wavelength of ligt in glass is :

Light of wavelength 6400overset@A incident normally on a plane paralle

1.	Light of wavelength 6400overset@A incident normally on a plane paralled glass slab thickness 5 cm and mu = 1.6. The beam takes the same time to travel from source to the incident surface as it takes to travel through the slab. The distance between the source and incident surface and wavelength of ligt in glass is :
Answer» `8 CM 4000overset@A` `5 cm 4000overset@A` `4 cm, 2000overset@A` `8 cm, 7000overset@A` Answer :C

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