Ciliary Muscles

Q. The eye lens is held in position by ___.

1. retina
2. ciliary muscles
3. pupil
4. iris

Q. The change in focal length of an eye-lens is caused by the action of the :
(a) pupil (b) retina (c) ciliary muscles (d) iris

Q.

What is a ciliary muscle?

Q.

While looking at nearby objects, the muscle _________the eye lens so as to _________ its focal length.

1. compresses, increase

2. compresses, decrease

3. expands, increase

4. expands, decrease

Q.

What is accommodation?

Q. Ciliary muscles of human eye can contract or relax. How does it help in the normal functioning of the eye ?

Q.

What do the ciliary muscles do when you are focusing on a nearby object ?

Q. Name the part of our eyes which helps us to focus near and distant objects in quick succession.

Q.

State the changes that occur in the following structures when the eye accommodates for near vision.

(a) Ciliary muscle

(b) Suspensory ligament

(c) Lens

Q. Ciliary muscle while reading a book and while driving.

1. flattens
2. expands
3. contracts
4. weakens

Q.

How are we able to see nearby and also the distant objects clearly?

Q. What is the persistence of human eye in seconds?.

Q. An object is moved closer to an eye. What changes must take place in the eye in order to keep the image in sharp focus ?

Q.

Why does the eye need to change the focal length of the eye lens?

1. To neglect the chromatic aberration

2. When object distance changes, to form the image at retina

3. As the position of retina keeps on changing

4. To keep the eye clean and active

Q.

As we increase the distance of an object from the eye, the image distance:

1. decreases

2. increases

3. First increases then decreases.

4. remains same.

Q. The eye lens is held in position by ___.

1. retina
2. pupil
3. iris
4. ciliary muscles

Q. Cilliary muscles contract to see nearby objects.

1. False
2. True

Q. In the following figure, the part whose focal length can be changed is:-

1. 
2. 
3. 
4. 

Q. The eye lens is held in position by ___.

1. retina
2. iris
3. ciliary muscles
4. pupil

Q. Cilliary muscles contract to see nearby objects.

1. False
2. True

Q. An object is moved closer to an eye. What changes must take place in the eye in order to keep the image in sharp focus ?

Q.

When the ciliary muscles are relaxed, then the focal length of the eye lens ___.

1. decreases

2. remains constant

3. first increases then decreases

4. increases

Q. Ciliary muscle while reading a book and while driving.

1. flattens
2. expands
3. contracts
4. weakens

Q.

Why does the eye need to change the focal length of the eye lens?

1. To neglect the chromatic aberration

2. When object distance changes, to form the image at retina

3. As the position of retina keeps on changing

4. To keep the eye clean and active

Q.

If you are looking at the moon, then what happens to your ciliary muscles?

1. Expand

2. Remains in the previous position

3. Can't say

4. Contract

Q.

When you keep objects very close to the eye the ciliary muscles ________.

1. remain same

2. expand

3. contract

4. reflects all the light

Q.

When the ciliary muscles are relaxed, then the focal length of the eye lens ___.

1. remains constant

2. increases

3. decreases

4. first increases then decreases

Q. Which of the following statements is true for a human eye?

1. Iris controls the amount of light entering the eye.
2. Iris helps in changing the focal length of our eye lens.
3. Cornea controls the size of the pupil of the eye.
4. Ciliary muscles change the size of the pupil.

Q.

When you keep objects very close to the eye the ciliary muscles ________.

1. expand

2. contract

3. remain same

4. reflects all the light