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%
80%
30
flagUkraine
6%
6%
13%
73%
15
flagNorway
6%
4%
23%
65%
43
flagFrance
3%
9%
30%
57%
33
flagthe United Kingdom
6%
13%
24%
55%
291
flagAustralia
2%
5%
37%
54%
35
flagthe Netherlands
3%
9%
33%
54%
33
flagthe United States
10%
17%
21%
50%
456
flagItaly
7%
14%
25%
53%
28
flagPoland
10%
15%
23%
49%
15866
flagRepublic of Ireland
7%
29%
14%
48%
41
flagGermany
5%
19%
28%
46%
177
flagDenmark
6%
20%
26%
46%
15
flagPakistan
13%
26%
13%
46%
15
flagCanada
13%
10%
29%
45%
37
flagthe Philippines
23%
23%
11%
41%
17
flagIndia
9%
22%
25%
40%
127
flagUnknown
14%
14%
32%
38%
802
flagSweden
14%
14%
37%
33%
27
flagBelgium
7%
21%
42%
28%
14

Gender

men42%
women48%
conjuctiva
12%
10%
pupil
15%
17%
iris
30%
22%
a layer behind retina
42%
49%

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Which part of a dog's or a cat's eye reflects the light?
1004
49%

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