For a ray of light incident on a prism of angle A, the wrong statement is 

When a light ray is incident on a prism of angle A 

Consider for smaller angles of A  

using this relation 

(i) we get deviation increases with increase of Angle A 

(ii) we get deviation increases with increase of refractive index 

(iii) Angle of deviation for violet colour is more than angle of deviation of red colour 

(iv) All colours into which the ray is dispersed will not emerge as a parallel beam