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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chromosphere
corona
stratosphere
photosphere
answers
flagIndia
14%
24%
7%
53%
113
flagCanada
20%
10%
20%
50%
10
flagAustralia
23%
23%
11%
41%
17
flagGermany
33%
18%
7%
40%
77
flagPoland
16%
38%
10%
33%
3802
flagAustria
25%
37%
6%
31%
16
flagthe Philippines
23%
30%
15%
30%
13
flagthe United States
19%
30%
19%
29%
72
flagthe United Kingdom
16%
45%
9%
29%
31