Children of the Moken tribe spend much of their days foraging for food underwater. Their eyes are adapted to this; their lenses are capable of more accommodation and, when they dive, their pupils contract. increased
1.00
1.33
1.38
decreased
a. The indices of refraction for the lens of the eye and for water very similar.
b. This means the refractive power of the lens of the eye is when a person is underwater (unless they wear goggles). c. This can be corrected (at least partially) if the curvature of the lens is (larger accomodation).
d. We also know that a wide aperture can result in blurriness, so, to further reduce the blurriness associated with underwater vision, the pupil's diameter should be (as in a pinhole camera).