English

The following figure show the change in the shape of the lens while seeing distant and nearby objects. Complete the figures by correctly labelling the diagram. - Science and Technology 1

Advertisements
Advertisements

Question

The following figure show the change in the shape of the lens while seeing distant and nearby objects. Complete the figures by correctly labelling the diagram.

Diagram

Solution

Light coming from a nearby object-

shaalaa.com
  Is there an error in this question or solution?
Chapter 7: Lenses - Answer the Following

APPEARS IN

RELATED QUESTIONS

Write the function of the following part of the human eye: ciliary muscles


How does the eye regulate the amount of light that falls on the retina?


The optical prescription for a pair of spectacles is :
Right eye : −3.50 D
Left eye : −4.00 D 

Are these lenses thinner at the middle or at the edges?


A person got his eyes tested by an optician. The prescription for the spectacle lenses to be made reads :
Left eye : +2.50 D
Right eye : +2.00 D 

 Which lens bends the light rays more strongly?


Name the part of the eye: 

 which changes the focal length of eye-lens.

 


Name that part of the eye which is equivalent to the photographic film in a camera.


Give the scientific names of the following parts of the eye: 

a hole in the middle of the iris.  


 Explain the functions of the following parts of the eye:
(i) cornea
(ii) iris
(iii) pupil
(iv) ciliary muscles
(v) eye-lens


Which part brings the image into sharp focus on the retina? How does it do this?


A student sitting on the last bench in the class cannot read the writing on the blackboard clearly but he can read the book lying on his desk clearly. Which of the following statement is correct about the student?
(a) The near point of his eyes has receded away.
(b) The near point of his eyes has come close to him.
(c) The far point of his eyes has receded away.
(d) The far point of his eyes has come closer to him.


How much is our field of view: 

with one eye open?


How much is our field of view: 

 with both eyes open?


Five persons A, B, C, D and E have diabetes, leukaemia, asthma, meningitis and hepatitis, respectively. 

 Which of these persons can donate eyes? 


Name the following:

The photoreceptors found in the retina of the eye.


Mention, where in living organism is the following located and state their main function:
Fovea centralis


Mention if the following statement is true (T) or false (F) Give reason.

Ciliary muscles regulate the size of the pupil


State the main functions of the following: 
 Coronary Artery  


Answer the following question.
Write the structure of eye lens and state the role of ciliary muscles in the human eye.


What are the functions of tears?


Differentiate between:

Vitreous humour and Aqueous humour.


Name the following:
The focal length of the lens is altered by the contraction of which type of muscles.


Name the following:
The region in the eye where the rods and cones are located.


State the Function:
Aqueous humour


Complete the following sentence with appropriate Word
The photoreceptor cells of the retina sensitive to colour are:


A small hole of changing diameter at the centre of Iris is called _______.


Write the name.

The screen with light sensitive cells in human eye.


Complete the paragraph by choosing the right options given below.

(minimum, near point, 25 cm, farthest, farthest distance, far point)

The _______ distance of an object from a normal eye, at which it is clearly visible without stress on the eye, is called the minimum distance of distinct vision. The position of the object at this distance is called the _______ of the eye, for a normal human eye, the near point is at _______. The _______ distance of an object from a human eye, at which it is clearly visible without stress on the eye is called _______ of distinct vision. The position of the object at this distance is called the _______ of the eye.


The black opening between the aqueous humour and the lens is called ____________.


When light rays enter the eye, most of the refraction occurs at the ____________.


The pigmented circular area seen in front of the eye:


A prism ABC (with BC as base) is placed in different orientations. A narrow beam of white light is incident on the prism as shown in Figure . In which of the following cases, after dispersion, the third colour from the top corresponds to the colour of the sky?

(i) (ii) (iii) (iv)

The coloured portion of the eye is the ______.


Which cells of the retina enable us to see coloured objects around us?


With reference to human eye, answer the following question.

What is blind spot?


Vitreous humour is present between ______.


Write in proper sequence the names of all the parts of the human eye through which the light rays coming from an object pass before they form an image on the retina.


Name the following:

Place of best vision in the retina of the eye.


Name the following:

The layer of the wall of the eye-ball that corresponds to the black lining of the box of a camera


With reference to human eye answer the question that follow:

Name the part of the eye associated with the layer providing nourishment to the eye.


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×