In a college dormitory, there is a temporary medical checkup area set up in the communal lounge for annual health screenings. The lounge is a large room that has been divided by a series of opaque curtains hanging from ceiling tracks to create private areas for the checkups. Each private area is essentially a cubic space formed by curtains on three sides, with the fourth side being open for entry and exit.

In one such curtained area, Anika is undergoing a vision test. She is facing the curtain wall, and there is a chart with letters behind her which she should read via a mirror in front of her to test her vision. Meanwhile, Jamal is on the other side of the curtain where Anika is facing, waiting for his turn for a hearing test. There's a gap of about two feet from the bottom of the curtains to the floor for safety and ventilation purposes.

Outside the curtained areas, Zhen is seated, filling out a health questionnaire. His chair is positioned so that he can see under the curtains into the area where Anika is seated. Marcella, the nurse conducting the health screenings, is walking around to each curtained area to check on the progress of the checkups.

The question is: From their various positions, what can Jamal, Zhen, and Marcella see of Anika and what is obscured? Additionally, how much can Anika see of the area outside her curtain?

Provide a brief response.
Given Anika is inside a curtained area and facing the curtain wall for a vision test, she has a very limited view of the space outside her area. She may notice someone's feet and lower legs if they are close to her curtain, but that is about all she can see from her seated position, given the two feet gap at the bottom. Her view is predominantly of the curtain and whatever is reflected in the mirror for her test.

Jamal, who is on the other side of Anika's curtain, cannot see Anika directly since the curtains are opaque. The position of the gap at the bottom of the curtains is irrelevant to his line of sight because he is waiting for his turn and is not positioned to look under the curtains. He can, however, potentially hear sounds from Anika's area, given that the curtains would not completely block sound.

Zhen, who is seated outside with a view under the curtains, can observe the lower portion of Anika's body, particularly her feet and lower legs. The opaque nature of the curtains still prevents him from seeing anything above the two-foot gap. His vantage point does not allow him to see the vision chart or the mirror, as they are positioned above the level obscured by the curtains and presumably against the curtain Anika is facing.

Marcella, the nurse, as she walks around, can only see a similar lower portion of Anika's body from outside the curtain area, unless she approaches the open side of the curtained space. From the open side, Marcella can fully view Anika and the interior of the curtained area. While walking around, Marcella also knows who is in each curtained area and what tests they're undergoing, because of her role in coordinating the checkups. 

Therefore, Anika's privacy concerning her test is maintained from the perspective of being viewed while seated. Those outside her curtained area can only see her partially from the knee down, and while insiders adjacent to her cannot see her at all, the partition does not prevent sounds from traveling into adjacent areas.