physics of the eye

Question 1

where does the largest change in refractive index occur`?

Answer 1

.the largest change in refractive index occurs at the cornea , about 2/3 of the power of the eye.
.the lens provides the remaining power to produce image on retina

Question 2

what happens in unaccommodated eye?

Answer 2

the eye is most relaxed when viewing distant objects

Question 3

what happens in accommodated eye?

Answer 3

the lens is made thicker and more converging by the action of ciliary muscle surrounding it

Question 4

how is chromatic aberration minimised?

Answer 4

by the arrangement of cones in foveal area

Question 5

what is fovea?

Answer 5

fovea has the highest visual acuity

fovea lies in area with no blue cones

Question 6

what is the function of iris?

Answer 6

constricts or dilates the pupil

Question 7

what is the function of pupil?

Answer 7

the pupil is responsible for controlling the amount of light entering the eye

Question 8

what happens in dim light ?

Answer 8

pupil dilation

Question 9

what happens in bright light?

Answer 9

pupil contraction

Question 10

what is cornea?

Answer 10

together with the lens is the focussing element

Question 11

what is retina?

Answer 11

sensory layer that lines the very back of the eye