Near Point & Far Point

Q.

What is the opposite word for Far?

Q.

What is the :
(a) far point of a normal human eye ?
(b) near point of a normal human eye ?

Q.

A person with a myopic eye cannot see objects beyond $1.2\mathrm{m}$ distinctly. What should be the type of corrective lens used to restore proper vision?

Q.

What is the function of crystalline lens in human eye?

Q. What is the range of vision of a normal eye?????

Q. What is the least distance of distinct vision for a normal human eye ?

Q. Question 3
The least distance of distinct vision for a young adult with normal vision is about

(a) 25 m
(b) 2.5 cm
(c) 25 cm
(d) 2.5 m

Q. The least distance of distinct vision for a young adult with normal vision is about :
(a) 25 m (b) 2.5 cm (c) 25 cm (d) 2.5 m

Q.

Here are few units of time, arrange them in ascending order second, day, year, month, minutes, hour.

Q.

Near and Far points of a healthy human eye are:

1. 25 cm and infinity

2. 25 cm and 100 cm

3. 0 and infinity

4. 0 and 25 cm

Q. What are the various applications of lens?

Q.

Far point of a normal eye is situated at:

1. 25 cm

2. 400 cm

3. Infinity

4. 50 cm

Q.

A man with defective eyes cannot distinctly see an object at a distance more than $60cm$ from his eyes . The power of the lens to be used will be

1. $60D$

2. $-60D$

3. $-1.66D$

4. $\frac{1}{1.66}D$

Q.

Among kilo, milli and centi, the smallest is centi.

1. True
2. False

Q.

What is the range of vision of human eye?

1. 25cm to 1000m

2. 25m to infinity

3. 0 to infinity

4. 25 cm to infinity

Q.

Least distance of distinct vision of a normal human eye is 25 cm

1. True

2. False

Q. Question 3
What is the far point and near point of the human eye with normal vision?

Q.

Explain why the near point increases with age.

Q.

The power of accommodation of the eye is the maximum variation of its power for focusing nearby and distant objects. For a young person the power of accommodation is about

1. $1D$

2. $2D$

3. $4D$

4. $10D$

Q.

The near point of a hypermetropic eye is 75 cm from the eye. What is the power of the lens required to enable him to read clearly a book held at 25 cm from the eye?

1. 2.66D

2. 3.8D

3. 3D

4. 2D

Q. The eye lens is ____ when the ciliary muscles are in contraction, and it is _____ when the ciliary muscles are in relaxed state.

1. thin, thin
2. thick, thick
3. thin, thick
4. thick, thin

Q. Functions of crystalline lens in eyes????

Q. The eye is a natural optical device by which humans can see the objects around them. It forms an inverted and real image on the retina, by the phenomenon of refraction of light through a natural convex lens. Sam is unable to read anything closer than 75 cm. His mother discussed the same with the doctor. The doctor explained this vision defect to her and told her how it is corrected.
B) The power prescribed by the doctor to see the newspaper clearly placed at 25 cm. ​

Q.

What is the far point for a normal eye?

1. 25 cm

2. 1000 m

3. 20 cm

4. infinity

Q.

In order to see comfortably for a normal human eye, what is the minimum distance at which an object should be placed?

1. 50 mm

2. 25 cm

3. 50 cm

4. 25 mm

Q. The farthest point, upto which the eye can see objects clearly, is called ________, and is ________ for a normal eye.

1. far point, infinity
2. range of vision, $25cm$
3. near point, $50cm$
4. power of accommodation, $100m$

Q. Study the following diagram carefully and then answer the questions that follow. The diagram is depicting a defect of the human eye.
(i) Identify the defect shown in the diagram.
(ii) Give two possible reasons for the above defect.
(iii) Draw a neat labelled diagram to show how the above defect can be rectified.

Q. Focal length of eye lens is changes by.

1. Pupil
2. Iris
3. Cornea
4. Ciliary muscles

Q. Question 3
The least distance of distinct vision for a young adult with normal vision is about

(a) 25 m
(b) 2.5 cm
(c) 25 cm
(d) 2.5 m

Q. The minimum distance at which objects can be seen without any strain is

1. $25cm$
2. Near point
3. Least distance of distinct vision
4. All of the above