The retina of a vertebrate eye contains ....

The space between the cornea and the lens is called .....

Given below are the two statements regarding photoreceptor cells of the human eye.
Statement $I$: The three types of cone cells have their own characteristic photopigments that respond to red,green,and blue lights.
Statement $II$: Sensation of white light is produced due to simultaneous equal stimulation of all three types of cone cells.
In the light of the above statements,choose the correct answer from the options given below:

Aqueous humour is present

$X -$ Rod cells' function is twilight (scotopic) vision.
$Y -$ Cone cells' function is daylight (photopic) vision.

Which structure of the eye is involved in focusing the eye?