The aqueous humor and vitreous humor are separated by the .....

Rhodopsin pigment is found in

The cornea and lens of mammalian eyes are both

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:

The part of an eye which acts like a diaphragm of a photographic camera is

Define the location and function of the following structures:
$(1)$ Epithalamus
$(2)$ Rod cells