An equilateral prism is made from a material of refractive index μ. The angles of minimum deviation, for this prism, when kept in (i) air (ii) a transparent medium of refractive and μ' , are found to be D and D’, respetively. We would then have
(1) \(\frac{sin(30°+\frac{D'}{2})}{sin(30°+\frac{D}{2})}=μ\)
(2) \(\frac{sin(30°+\frac{D'}{2})}{sin(30°+\frac{D}{2})}=\frac{μ}{μ'}\)
(3) \(\frac{sin(30°+\frac{D}{2})}{sin(30°+\frac{D'}{2})}=\frac{μ}{μ'}\)
(4) \(\frac{sin(30°+\frac{D'}{2})}{sin(30°+\frac{D}{2})}=\frac{1}{μ'}\)
