Question

If rays coming from extreme ends of an object forms an angle of 30 from observers eye.whether the obserever is able to whole object or not ?

Answer 1

yes if the observer is near to the the object and if the distance became too larger the image became blurred
it will help u

Answer 2

It all depends on the human field view. You are referring to vertical vision angle of human eye. 30⁰ is limit for normal vision. So, you can see the object height wise fully.

Please refer the attached figure for other details.