which belongs in the area marked x?\nreal\nvirtual\nlarger than object\nupside down

Answer:

Real

Explanation:

Step1: Recall lens - image properties

Both concave and convex lenses can form real images under certain conditions.

Step2: Analyze virtual property

Virtual images are not common to both in the general sense here, so it's not the answer.

Step3: Analyze size property

Images can be smaller or larger than the object depending on the lens and object - distance, so "Larger than object" is not always true for both.

Step4: Analyze orientation property

Images can be upright or upside - down depending on the situation, so "Upside down" is not always common to both.