The effective focal length of a normal human eye’s lens system, when focused on

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1. The effective focal length of a normal human eye’s lens system, when focused on distant objects, is approximately?

25 cm

1 metre

2.5 mm

2.5 cm

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The eye’s optical system, including its cornea and lens together, has an effective focal length of roughly 2.5 cm — closely matching the eyeball’s own depth.