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# when a light of wavelength 400nm is incident on the surface of aglass slab making an angle of 30degree with its surface the angle of refraction 30degree find the refractive index of glass slab?

Eshan
2 years ago
Dear student,

Angle of incidence=i=$\dpi{80} 90^{\circ}-30^{\circ}=60^\circ$
Ange of refraction=r=$\dpi{80} 30^\circ$
Use$\dpi{80} sin i=\mu sinr$