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Answer 1

❍ Option ⓒ μA

$\sf\alpha = 180° - 90° - A = 90 - A$

$\sf r =90 - \alpha = A$

• From snell's law

$\sfμ _{1}sini = \sfμ _{1}sinr$

$\sf1sini = μ sinA$

• For small angle

$\sf i = μA$