Given :

Equation of plane : y = 3

To Find : Direction cosines of the normal i.e.

Formula :

1) Direction cosines :

If a, b & c are direction ratios of the vector then its direction cosines are given by

Answer :

For the given equation of plane

y = 3

Direction ratios of normal vector are (0, 1, 0)

= 1

Therefore, direction cosines are