Question

Which is not a refractive medium of eye?

• A. Lens
• B. Vitreous humour
• C. Aqueous humour
• D. Pupil

Answer 1

Answer: (D)

Pupil

A. Lens of eye is a crystalline structure in the eye ball which is held in place by ligaments that are attached to ciliary body. It is biconvex in nature and focus the light rays on the retina.

B. Aqueous humour is a transparent fluid present between cornea and lens.

C. Vitreous humour is a transparent gel present between lens and retina.

D. Pupil is the aperture of eye through rays enter the eye.

Refraction of light occurs when it enters a different medium and its speed gets changed. Pupil is not a refractive medium because it is an aperture or hole through which light is directly passing.

So, the correct answer is 'Pupil'.