Speed of light depend on refractive index of material. Air and glass have different refractive index thus speed will be different.
The space Between every two adjacent lines(d) is inversely proprtional to number of lines per mm N.
Relation between transmittance and absorbance is
A = 2 - log10 T
4) speed = distance/time
6) this condition is called constructive interference as amplitude add togather.
7) percentage error =
[Approximate Value − Exact Value| /|Exact Value|] ×100
More light absorbed by a material having high absorption coefficient.
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