THE MAXIMUM VALUE OF INDEX OF REFRACTION
OF A MATERIAL OF A PRISM WHICH ALLOWS THE
PASSAGE OF LIGHT THROUGH IT WHEN THE
REFRACTING ANGLE OF THE PRISM IS 'A' IS
a)(1-sinA/2)^1/2 b)(1-cotA/2)^1/2
c)(1-(tanA/2)^2)^1/2 d)(1+(cotA/2)^2)1/2
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