Question

The pupil (the opening through which light enters the lens) of a house cat's eye is round under low light but ciliary muscles narrow it to a thin vertical slit in very bright light. Assume that bright light of wavelength 560 nm is entering the eye parallel to the principal axis of the lens and that the pupil has narrowed to a slit that is 0.500 mm wide. What are the three smallest angles on either side to the central maximum at which no light will reach the cat's retina for the following?

(a) if we imagine the eye is filled with air

m = 1 |
rad |

m = 2 |
rad |

m = 3 |
rad |

(b) if we take into consideration that in reality the eye is filled
with a fluid having index of refraction of approximately 1.4

m = 1 |
rad |

m = 2 |
rad |

m = 3 |
rad |

Answer #1

1. Light traveling in air (index of refraction 1.00) falls onto
a thin plastic film (index of refraction 1.30) of unknown thickness
that covers glass (index of refraction 1.50). What minimum non-zero
thickness is needed such that wavelengths of 650 nm in air are
bright in the reflection?
2. You observe two point sources of light that are spaced 10 cm
apart which are each emitting light of wavelength of 590 nm. If the
diameter of your pupil is 2...

A light ray in air, indicated by the arrow, is incident on a
convex glass lens at an angle of 31° to the normal. a) Some of the
light will be reflected from the lens. At what angle will it be
reflected? b) Find the angle at which the light ray is refracted
when entering the lens. (5 points) c) Find the angle at which the
ray is incident on the other side of the lens and the angle of...

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