In the blind spot where the optic nerves leave the eye,

When the object is at a distance of more than $6 \text{ metres}$,at that time

What is the function of cone cells?

The eyes of cat, cow, buffalo and some nocturnal animals shine in the night. It is due to the presence of $tapetum \text{ } lucidum$ between the choroid and retina. This shining is due to the presence of a pigment made of:

Match the following columns and select the correct option.

Column $I$	Column $II$
$(a)$ Rods and Cones	$(i)$ Absence of photoreceptor cells
$(b)$ Blind Spot	$(ii)$ Cones are densely packed
$(c)$ Fovea	$(iii)$ Photoreceptor cells
$(d)$ Iris	$(iv)$ Visible coloured portion of the eye

The choroid is thin over the posterior two-thirds of the eyeball,but it becomes thick in the anterior part to form the: