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
flagNorway
6%
6%
25%
61%
31
flagFrance
3%
10%
25%
60%
28
flagthe Netherlands
0%
10%
30%
60%
20
flagAustralia
0%
4%
37%
58%
24
flagthe United States
10%
18%
19%
50%
396
flagthe United Kingdom
7%
16%
26%
50%
200
flagRepublic of Ireland
7%
28%
14%
50%
28
flagItaly
9%
13%
22%
54%
22
flagPoland
10%
17%
24%
47%
9553
flagthe Philippines
20%
20%
13%
46%
15
flagGermany
5%
19%
30%
45%
119
flagCzech Republic
0%
36%
18%
45%
11
flagCanada
13%
13%
30%
43%
30
flagIndia
9%
22%
26%
41%
104
flagPakistan
16%
25%
16%
41%
12
flagDenmark
10%
20%
30%
40%
10
flagSweden
17%
23%
23%
35%
17
flagUnknown
8%
22%
37%
28%
45

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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