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%
24%
64%
37
flagthe United Arab Emirates
0%
18%
18%
63%
11
flagAustralia
3%
3%
33%
60%
30
flagFrance
3%
10%
30%
56%
30
flagthe United Kingdom
6%
14%
24%
55%
241
flagthe United States
10%
18%
19%
51%
411
flagRepublic of Ireland
6%
31%
12%
50%
32
flagthe Netherlands
4%
8%
37%
50%
24
flagPoland
10%
16%
23%
48%
11545
flagItaly
8%
12%
28%
52%
25
flagGermany
5%
17%
29%
46%
139
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
flagCanada
15%
12%
33%
39%
33
flagUnknown
15%
15%
33%
34%
335
flagSweden
22%
22%
22%
33%
18

Gender

men42%
women47%
conjuctiva
11%
10%
pupil
15%
18%
iris
30%
23%
a layer behind retina
42%
47%

Language versions

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