After tracing the path of rays of light through a glass slab for three different angles of incidence, a student measured the corresponding values angle of refraction r and angle of emergence e and recorded them in the table given below S.NO∠i∠i∠eI30∘20∘31∘II40∘25∘40∘III50∘31∘49∘ The correct observations are

After tracing the path of rays of light through a glass slab for three

1.	After tracing the path of rays of light through a glass slab for three different angles of incidence, a student measured the corresponding values angle of refraction r and angle of emergence e and recorded them in the table given below S.NO∠i∠i∠eI30∘20∘31∘II40∘25∘40∘III50∘31∘49∘ The correct observations are
Answer» After tracing the path of rays of light through a glass slab for three different angles of incidence, a student measured the corresponding values angle of refraction r and angle of emergence e and recorded them in the table given below $\begin{matrix} S . N O & ∠ i & ∠ i & ∠ e I & 30^{\circ} & 20^{\circ} & 31^{\circ} I I & 40^{\circ} & 25^{\circ} & 40^{\circ} I I I & 50^{\circ} & 31^{\circ} & 49^{\circ} \end{matrix}$ The correct observations are