Accommodation of Lens

Q.

Even when the objects are at different distances from the eye, clear images are formed on the retina. What can be the reason behind this?

1. Power of accommodation

2. Power of lens

3. Short eyeball

4. Long eyeball

Q. When objects at different distances are seen by the eye, which of the following remains constant?

1. The image distance from the eye lens
2. The radius of curvature of the eye lens
3. The focal length of the eye lens
4. The object distance from the eye lens

Q. The ability of eye lens to adjust its focal length is called

1. presbyopia
2. accommodation
3. myopia
4. hypermetropia

Q.

Range of vision for a normal human eye is:

1. 25 cm to infinity

2. 24.5cm to infinity

3. 23cm to 25cm

4. 25cm to 25m

Q.

Far point of a normal eye is situated at:

1. 25 cm

2. 400 cm

3. 50 cm

4. Infinity

Q.

What is the far point for a normal eye?

1. 1000 m

2. 25 cm

3. 20 cm

4. infinity

Q.

In human beings two eyes are positioned at the front of the head and it thus reduces the field of view in favour of what is called stereopsis.

1. True

2. False

Q.

When you are looking at the objects closer to the eye, the focal length of eye lens:

1. Remains same

2. Increases

3. Decreases

4. Fluctuates

Q. What is the far point of a human eye with normal vision?

1. Infinity
2. 50 cm
3. 25 cm
4. 100 cm

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