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A. θ₂=11.9°
b. θ₂=14.4°
c. θ₂=19.3°

* Sinθ₂=n₁Sinθ₁/n₂
a. Sinθ₂=1.0003 (Sin 30°)/2.42
            =0.206673553 or 0.207
         θ₂= Sin⁻¹0.207
         θ₂=11.94° or 11.9°

Just substitute 40° and 50° to get the answer for b and c :)
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