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
flagSwitzerland
3%
10%
6%
79%
29
flagUkraine
0%
7%
14%
78%
14
flagNorway
6%
4%
23%
65%
43
flagFrance
3%
9%
30%
57%
33
flagthe Netherlands
3%
9%
31%
56%
32
flagAustralia
3%
3%
37%
56%
32
flagthe United Kingdom
6%
13%
24%
55%
282
flagthe United States
9%
17%
20%
51%
441
flagItaly
7%
11%
26%
53%
26
flagCzech Republic
0%
28%
21%
50%
14
flagPoland
10%
16%
23%
49%
15138
flagRepublic of Ireland
7%
29%
14%
48%
41
flagGermany
5%
20%
27%
46%
173
flagPakistan
13%
26%
13%
46%
15
flagCanada
14%
11%
31%
42%
35
flagthe Philippines
23%
23%
11%
41%
17
flagIndia
9%
23%
27%
38%
118
flagUnknown
14%
14%
32%
37%
772
flagSweden
14%
14%
37%
33%
27
flagBelgium
7%
23%
46%
23%
13

Gender

men41%
women48%
conjuctiva
12%
10%
pupil
15%
17%
iris
30%
22%
a layer behind retina
41%
49%

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