Which part of a dog's or a cat's eye reflects the light?

conjuctiva
pupil
iris
a layer behind retina
Many ver­te­brates, es­pe­cial­ly noc­tur­nal ones, have the re­flect­ing layer called tapetum lucidum. It reflects the light back through the retina, in­creas­ing the amount of light avail­able to the pho­tore­cep­tors.

Answers distribution

conjuctiva
pupil
iris
a layer behind retina
answers
flagUkraine
0%
7%
14%
78%
14
flagNorway
5%
5%
25%
63%
36
flagAustralia
0%
4%
36%
60%
25
flagFrance
3%
10%
30%
56%
30
flagthe United Kingdom
5%
14%
23%
55%
234
flagthe Netherlands
0%
9%
36%
54%
22
flagRepublic of Ireland
6%
29%
12%
51%
31
flagthe United States
10%
18%
19%
50%
407
flagPoland
10%
17%
23%
48%
10458
flagItaly
8%
12%
28%
52%
25
flagGermany
5%
18%
28%
46%
132
flagthe Philippines
20%
20%
13%
46%
15
flagCzech Republic
0%
30%
23%
46%
13
flagLithuania
27%
18%
9%
45%
11
flagIndia
9%
22%
26%
41%
104
flagPakistan
16%
25%
16%
41%
12
flagDenmark
10%
20%
30%
40%
10
flagCanada
15%
12%
33%
39%
33
flagSweden
22%
22%
22%
33%
18
flagUnknown
12%
20%
33%
32%
78

Gender

men43%
women48%
conjuctiva
9%
8%
pupil
15%
18%
iris
30%
23%
a layer behind retina
43%
48%

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Which part of a dog's or a cat's eye reflects the light?
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