Structure and Function of the Human Eye MCQs

Q1. The eye works most like which optical device?

• A.a microscope
• B.a periscope
• C.a camera
• D.a kaleidoscope

Answer: C. a camera

What does the chapter say about this? The eye, like a camera, forms a real inverted image on a screen (retina). Does that line up with one of the options? Yes - Correct. And the rest? option A) 'a microscope' is wrong because The eye forms a real image like a camera; option B) 'a periscope' doesn't hold - A periscope uses mirrors; the eye uses a lens. Pick: C) a camera.

Q2. As light reflected from a soaring kite first meets the front of a rooftop astronomer's eye, which transparent surface bends it the most toward a focus?

• A.the cornea
• B.the retina
• C.the eye lens
• D.the iris

Answer: A. the cornea

The air-to-cornea boundary is the largest jump in optical density in the eye, so the curved cornea provides roughly two-thirds of the total refraction; the lens only fine-tunes the focus.

Q3. Stepping from blazing sunshine into a dim cinema, a bus conductor finds the dark central opening of her eye grows larger; which structure has widened it?

• A.the iris
• B.the cornea
• C.the ciliary muscle
• D.the retina

Answer: A. the iris

The iris is a coloured muscular diaphragm; relaxing and contracting its muscles enlarges or shrinks the pupil, here widening it in the dark to admit more light.