What is the visible surface of the Sun called?

chromosphere
corona
stratosphere
photosphere
The photosphere is a layer below which the Sun becomes opaque to visible light. It is tens to hundreds of kilometers thick, and is slightly less opaque than air on Earth. Because the upper part of the photosphere is cooler than the lower part, an image of the Sun appears brighter in the center than on the edge or limb of the solar disk, in a phenomenon known as limb darkening.
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Answers by country

chromosphere
corona
stratosphere
photosphere
answers
flagIndia
10%
22%
5%
60%
68
flagGermany
34%
19%
6%
39%
46
flagthe Philippines
18%
27%
18%
36%
11
flagPoland
16%
38%
10%
33%
3509
flagthe United States
24%
24%
16%
32%
53
flagthe United Kingdom
15%
45%
10%
30%
20