1. What is the difference between a zoom knob and focus knob? 2. What is another name for the ocular lens? 3. Define working distance.

3. Soru Which of the following is a false statement about photoreceptors of the eye? A) Cones are active at high light levels and have high spatial acuity. B) Rods are responsible for scotopic vision while cones are responsible for photopic vision. C) Rods are active at low light level and have low spatial acuity. D) There are two types photoreceptors: rods and cones. E) The ratio of rods to cones in the retina is higher in humans than it is in dogs.

1. What happens if you try to use the coarse adjustment when the 10X lens is in place? 2. Assuming the light is on and the oculars are in place, what are the next 2 steps? (Answer in 3-5 sentences)

7. Describe how the field of view and the amount of available light change when going from low to high power lenses.