What part of the eye acts as the screen on which the image is formed?

What type of image is formed on the retina?

What is accommodation in the eye?

Why must the eye's lens power increase when focusing on a nearby object?

Define the optical power of the eye.

Estimate the power of an eye with effective focal length \(17\,\mathrm{mm}\).

What is the near point of a normal adult eye usually taken to be in simple optics problems?

What is myopia?

What type of lens corrects myopia?

What is hyperopia?

What type of lens corrects hyperopia?

A myopic person has a far point of \(2.0\,\mathrm{m}\). Estimate the power of glasses that let them see distant objects.

A myopic person has a far point of \(50\,\mathrm{cm}\). Estimate the corrective lens power for distant vision.

A hyperopic person has a near point of \(1.0\,\mathrm{m}\). What power reading glasses let them read at \(25\,\mathrm{cm}\)?

A person can focus from infinity to \(25\,\mathrm{cm}\). Estimate the accommodation range in dioptres, ignoring the fixed eye length in the comparison.

What does the pupil control?

What is the role of the iris?

Why is a corrective lens prescription expressed in dioptres rather than metres?

A corrected distant object should appear at a myopic person's far point. Why is the image produced by the glasses virtual?

Why can the simple eye model be treated like a thin-lens system only approximately?