3. How is the light from a candle made to form an image?
4. What different things must happen in order that one may see an object?
5. Make a sectional drawing of the eyeball, locating and naming all the parts.
6. Of what parts are the outer, middle, and inner coats of the eyeball made up?
7. What portions of the eyeball reflect light? What absorb light? What transmit light? What refract light?
8. Show how the iris, the crystalline lens, the retina, the ciliary muscle, and the cornea aid in seeing.
9. Trace a wave of light from a visible object to the retina.
10. Why does not the inverted image on the retina cause us to see objects upside down?
11. What change occurs in the shape of the crystalline lens when we look from distant to near objects? From near to distant objects? Why are these changes necessary? How are they brought about?
12. How does the method of adjustment, or accommodation, of the eyeball differ from that of a telescope or a photographer's camera?