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%
8%
16%
75%
12
flagthe Netherlands
0%
10%
26%
63%
19
flagNorway
6%
6%
25%
61%
31
flagFrance
4%
14%
19%
61%
21
flagAustralia
0%
4%
37%
58%
24
flagItaly
5%
15%
21%
57%
19
flagthe United States
10%
17%
19%
51%
389
flagthe United Kingdom
7%
17%
27%
48%
181
flagCanada
14%
14%
22%
48%
27
flagRepublic of Ireland
7%
29%
14%
48%
27
flagPoland
10%
17%
24%
47%
9101
flagthe Philippines
20%
20%
13%
46%
15
flagGermany
4%
20%
30%
45%
110
flagPakistan
16%
25%
16%
41%
12
flagIndia
10%
22%
27%
40%
99
flagSweden
12%
25%
25%
37%
16
flagUU
7%
28%
39%
21%
28

Gender

men44%
women48%
conjuctiva
9%
9%
pupil
15%
18%
iris
30%
23%
a layer behind retina
44%
48%

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