which of the following occurs when a person focuses on a nearby object (less than 20 ft away)?

a.ciliary zonule tightens
b. ciliary muscle contract
c. lens flattens
d. two of the above
e. all of the above

Expert Solution

ciliary muscle contract

The ciliary muscle is a ring of smooth muscle in the eye's middle layer that controls accommodation for viewing objects at varying distances

zonular fibers present in the eye that suspend the lens in position during accommodation

zonular fibers hold or flatten the lens

The circular ciliary muscle fibers affect zonular fibers in the eye enabling changes in lens shape for light focusing

When the ciliary muscle contracts, it pulls itself forward and moves the frontal region toward the axis of the eye. This releases the tension on the lens caused by the zonular fibers causes the lens to become more spherical, adapting to short range focus.

The effect of contraction is to decrease the diameter of the ring of ciliary muscle. The zonule fibers relax and the lens becomes more spherical, increasing its power to refract light for near vision.

Conversely, relaxation of the ciliary muscle causes the zonular fibers to become taut, flattening the lens, increasing the focal distance increasing long range focus.

gladiator answered 2 years ago

A certain lens focuses light from an object 2.15 m m away as an image 48.6...

A certain lens focuses light from an object 2.15 m m away as an image 48.6 cm c m on the other side of the lens. Two converging lenses are placed 30.0 cmcm apart. The focal length of the lens on the right is 20.5 cmcm , and the focal length of the lens on the left is 11.5 cmcm . An object is placed to the left of the 11.5 cmcm focal-length lens. A final image from both lenses...

When an object is placed at a distance greater than the focal length but less than twice the focal length from a convex lense

When an object is placed at a distance greater than the focal length but less than twice the focal length from a convex lense the image is diminished.the image is virtual.All of the other choices are not correct.the image is inverted.the image is formed on the same side as theobject.For an object placed in front of a concave lense,the image is always realthe image may be erect or inverted.the image is formed on the other side of thelense.the image may be...

Which of the following statements is definitely true when priceis less than average total cost...

Which of the following statements is definitely true when price is less than average total cost for a firm producing the profit-maximizing level of output in the short run?a.The firm will be earning negative total revenue.b.The firm is running a loss in an accounting sense, so that total revenue is less than total explicit costs.c. The firm is incurring an economic loss.d.The firm will minimize its losses by shutting down.

Suppose that when you’re 12 ft away from the source of a sound, it’s intensity is...

Suppose that when you’re 12 ft away from the source of a sound, it’s intensity is 3 X 10^-6 W/m^2, If you move so that you are now 6ft away from the source of the sound, what is the intensity? If you move again so that now you’re 24 ft away from the source of the sound, what is the intensity? At what point do you perceive the sound as having the highest amplitude?

When an object is located very far away from a convex mirror, the image of the...

When an object is located very far away from a convex mirror, the image of the object is 12.0 cm behind the mirror. Using a ray diagram drawn to scale, determine where the image is located when the object is placed 6.0 cm in front of the mirror. Note that the mirror must be drawn to scale also. In your drawing, assume that the height of the object is 3.0 cm. cm ---Select--- in front of behind the mirror As an...

Write an if-else statement for the following: If numDifference is less than -20, execute totalDifference =...

Write an if-else statement for the following: If numDifference is less than -20, execute totalDifference = -25. Else, execute totalDifference = numDifference. import java.util.Scanner; public class NumberDifference { public static void main (String [] args) { int totalDifference; int numDifference; Scanner scnr = new Scanner(System.in); numDifference = scnr.nextInt(); // Program will be tested with values: -19, -20, -21, -22. //solution goes here// System.out.println(totalDifference); } }

____ occurs when a homogenous and highly cohesive group is focuses on maintaining unanimity, thus failing...

____ occurs when a homogenous and highly cohesive group is focuses on maintaining unanimity, thus failing to evaluate alternatives fairly and suppressing contrary opinions both from within the group and from outside the group. Select one: a. Confirmation Bias b. Group Polarization c. Social Loafing d. Groupthink ____ is the tendency of a group to make more extreme decisions than they would make if the individual group members were acting individually. Select one: a. Collective Group Norms b. Group Polarization...

Which of the following statements is false? (a) If the payback period is less than the...

Which of the following statements is false? (a) If the payback period is less than the maximum acceptable payback period, accept the project. (b) If the payback period is greater than the maximum acceptable payback period, reject the project. (c) If the payback period is less than the maximum acceptable payback period, reject the project (d) Two of the above. What is the payback period for TangAsha company’s new project if its initial after tax cost is P10,000,000 and it...

Describe the process that occurs when an object is put into vibration and the sound wave...

Describe the process that occurs when an object is put into vibration and the sound wave energy travels across the room. How does it get there? And how does it eventually become electrical energy in your brain? Please describe the processes of auditory transduction from acoustic to mechanical to hydraulic to electrical, describing the parts of the auditory system involved at each change.

20. Which of the following occurs as a result of the neural tube defect? a. Anencephaly...

20. Which of the following occurs as a result of the neural tube defect? a. Anencephaly b. Holoprocencephaly c. Microcephaly d. Syringomyelia e. Corpus callosum agenesis 21. Vascular disease involving the aorta, carotid and ophthalmic arteries in elderly patients, which of the following? a. Wegener granulomatosis b. Takayasu disease c. Polyarteritis nodosa d. Kawasaki disease e. Giant cell arteritis 22. What is the inflammatory bowel disease characterized by the development of pseudopolyps with mucosal regeneration and the development of pseudopolyps...

Question