When Rosemary accused her daughter-in-law of stealing the spatula that she herself misplaced, she was MOST likely in the stage of Alzheimer's disease.

Second stage of Alzheimer's diseases.

Explanation:

Alzheimer's disease is a degenerative disease that is characterized by gradual loss of memory, elevation in problems related to behavior and thinking.

Alzheimer's disease occur due to the damage of nerve cells. The two major proteins that are held responsible for the Alzheimer's disease is the beta-amyloid protein and Tau protein.

Alzheimer's has been divided into 7 stages depending on the decree of decline in memory.

The disease is undetectable at first stage, During the second stage ,very mild loss in memory is  noticed gradually the degree of decline increases as we advance in stages. The seventh stage is then characterized by severe loss of memory.

In the given instance Rosemary recognizes her daughter in law but just forgets about the spatula. This shows a very mild decline in memory. So, it is more likely that Rosemary is in the second stage of Alzheimer's.

the index of refraction of the second medium is higher. i just took the test trust me !