Arrange and rewrite the terms in each group in the correct order to be in a logical sequence beginning with the term that is underlined:
PUPIL, Aqueous humour, Retina, Vitreous humour. (Begin with: Pupil)
Topic: Path of light through the eye
Answer
Pupil → Aqueous humour → Vitreous humour → Retina
This traces the path of LIGHT through the eyeball from front to back: PUPIL — the opening in the iris through which light enters AQUEOUS HUMOUR — the watery fluid in the front chamber, between cornea and lens VITREOUS HUMOUR — the jelly-like fluid filling the large chamber behind the lens RETINA — the light-sensitive layer at the back, where the image is formed
THE WAY TO REMEMBER which humour is which: AQUEOUS is watery and lies in front (aqua = water); VITREOUS is thick and glassy and lies behind (vitreous = glassy). The light meets the thin one first.
The full path, if a question asks for more: cornea → aqueous humour → pupil → lens → vitreous humour → retina → optic nerve → brain.