Question

For small angles Snell’s law becomes ______.

Options

• n₁i = n₂

• i = r

• n₁ = n₂r

• n₁i = n₂r

Answer 1

For small angles Snell’s law becomes n₁i = n₂r.

Explanation:

According to Snell's law, `(sin "i")/(sin "r") = "n"_2/"n"_1`

If angles are small, sin i ≈ i and sin r ≈ r,

Hence, `"i"/"r" = "n"_2/"n"_1` or i n₁ = r n₂