Human Eye and Colourful world
Telangana Board · Class 10 · Physical Sciences
Flashcards for Human Eye and Colourful world — Telangana Board Class 10 Physical Sciences. Quick Q&A cards covering key concepts, definitions, and formulas.
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What is the function of the human eye lens?
Answer
The eye lens helps form an image on the retina. It changes its focal length so that objects at different distances can be seen clearly.
What is the cornea?
Answer
The cornea is the transparent protective membrane covering the front sharply curved portion of the eye ball. It is visible from outside.
What is the pupil and why does it appear black?
Answer
The pupil is the small hole in the iris. It appears black because light entering it goes into the eye and very little light comes back out.
How does the iris control the amount of light entering the eye?
Answer
The iris expands the pupil in dim light so more light enters, and contracts the pupil in bright light so less light enters. It acts like a variable aperture.
What is the retina?
Answer
The retina is a delicate membrane at the back of the eyeball. It contains about 125 million rods and cones, and the real inverted image is formed here.
What is the function of rods and cones?
Answer
Rods identify the intensity of light, while cones identify colour. Together they help the brain understand the image seen by the eye.
Why is the image formed on the retina always at nearly the same distance from the eye lens?
Answer
The distance between the eye lens and retina is about 2.5 cm, so the image distance remains fixed. The eye adjusts its focal length to keep the image on the retina.
What is accommodation of lens?
Answer
Accommodation of lens is the ability of the eye lens to change its focal length.
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