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%
62%
35
flagAustralia
0%
4%
36%
60%
25
flagthe United Arab Emirates
0%
20%
20%
60%
10
flagFrance
3%
10%
27%
58%
29
flagthe Netherlands
0%
9%
33%
57%
21
flagRepublic of Ireland
6%
26%
13%
53%
30
flagthe United Kingdom
6%
15%
25%
52%
216
flagthe United States
10%
18%
19%
50%
398
flagPoland
10%
17%
24%
47%
9918
flagGermany
5%
18%
28%
47%
125
flagthe Philippines
20%
20%
13%
46%
15
flagItaly
8%
12%
29%
50%
24
flagIndia
9%
22%
26%
41%
104
flagPakistan
16%
25%
16%
41%
12
flagCzech Republic
0%
33%
25%
41%
12
flagCanada
12%
12%
34%
40%
32
flagDenmark
10%
20%
30%
40%
10
flagSweden
22%
22%
22%
33%
18
flagUnknown
10%
20%
37%
29%
58

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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49%

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