How to describe two different objects: (Assume: one apple and one banana here) "There are an apple and banana here." or "There are an apple and a banana here." ??
You will use is if the object is in singular. Eg:
There is an apple and a banana here.
You will use are if the objects are in plural. Eg:
There are apples and bananas here.
More details on verb agreement is given here.