Question

1. An octopus has eyes that are very similar to yours. If an octopus leaves the water, will it be nearsighted or farsighted? Explain.

2. If you are nearsighted, your vision is sharper outside in bright light than it is indoors in dimmer light. But if you have perfect vision, it is possible that, in very bright light, your vision could be slightly less sharp. Explain what is happening in each of these cases.

3. I have a combination of myopia and presbyopia—overall, the power of my visual system is too large, but I also have a very limited range of accommodation. My glasses have progressive lenses. The lenses are diverging lenses, with a negative power, but the magnitude of the power varies from a maximum at the top, for distance vision, to a minimum at the bottom, for close vision. With no correction, for my left eye, my near point is 15 cm, my far point is 20 cm. With my glasses on, my near point is about 25 cm, and my far point is infinity. What is the range of powers of the lens in my glasses?

Answer 1

Octopus eyes behaves as farsighted if medium is air because as soon as it comes out of water refractive index change so wavelength of light decreases and also there is effect of optics ,while in water his eyes behave like nearsighted.

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