To Experiment; Fill In The Blanks - Betzold 89947 Handbuch

Solution to experiment 5.5 "accommodation"
1. The focal point lies in front of the retina.
2. The focal point needs to be set back so it lies exactly on the retina. For the refractive power to decrease, the lens would need
to change its shape and become flatter. Lens no. 2 has the proper form and the focal point lies on the retina.
Solution to experiment 5.5 "accommodation"
1. After passing through the focal point the red light ray is at the bottom.
2. The image of the flower is formed upside-down on the retina.
7. Fill-in-the-blanks:
7.1 Nearsightedness / Farsightedness
If the eyeball is too long or the refractive power of the eye's lens is too strong it is called
____________________. The position of the focal point falls to the front and lies _______________ the
retina. Nearsighted people can see nearby objects ________________, whereas objects in the distance
________________________________________________.
_________________________ occurs when an eye is too short in proportion to its focusing power or the
refractive power is not strong enough. The focal point of the eye is set back and lies ___________ the
retina. People with farsightedness can see distant objects ______________________, but have difficulty
___________________ on objects that are up close.
The ciliary muscle is __________________ and the lens ____________________ when looking into the
distance. Nearby objects can be seen when the ciliary muscle ____________________ and the lens
thickens to a rounder shape and increases its curvature.
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