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प्रश्न
Mention if the following statement is true (T) or false (F) Give reason.
Blind spot is called so because no image is formed on it.
पर्याय
True
False
उत्तर
True
APPEARS IN
संबंधित प्रश्न
The human eye can focus objects at different distances by adjusting the focal length of the eye lens. This is due to ______.
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
State whether these spectacle lenses will converge light rays or diverge light rays.
Why does the eye-lens not have to do all the work of converging incoming light rays?
After testing the eyes of a child, the optician has prescribed the following lenses for his spectacles:
Left eye : + 2.00 D
Right eye : + 2.25 D
The child is suffering from the defect of vision called:
(a) short-sightedness
(b) long-sightedness
(c) cataract
(d) presbyopia
A man driving a car can read a distant road sign clearly but finds difficulty in reading the odometer on the dashboard of the car. Which of the following statement is correct about this man?
(a) The near point of his eyes has receded away.
(b) The near point of his eyes has come closer to him.
(c) The far point of his eyes has receded away.
(d) The far point of his eyes has come closer to him.
With both eyes open, a person's field of view is about:
(a) 90°
(b) 150°
(c) 180°
(d) 360°
The animals called predators have:
(a) both the eyes on the sides
(b) one eye on the side and one at the front
(c) one eye on the front and one at the back
(d) both the eyes at the front
Name the following:
The part of the eye responsible for its shape.
With reference to the functioning of the eye, answer the question that follow:
What is the shape of the lens during distant vision?
The figure below compares a part of our eye with a part of a photographic camera.
Name the corresponding parts of the eye the camera shown here that are comparable in function.
Correct and rewrite the statements by changing the biological term that is underlined for the statement:
The part of the eye which can be donated from a clinically dead person is the Retina.
Name the following:
White part of the eye.
Name the respective organs in which the following are located and mention the main function of each:
(i) Iris
(ii) Semicircular canals
Give the main function of the following:
Lachrymal glands
Answer the following question.
Trace the sequence of events Whichoccur when a bright light is focused on your eyes.
Draw a scientifically correct labelled diagram of a human eye and answer the questions based on it:
- Name the type of lens in the human eye.
- Name the screen at which the maximum amount of incident light is refracted?
- State the nature of the image formed of the object on the screen inside the eye.
When light rays enter the eye, most of the refraction occurs at the ____________.
Explain the structure and functioning of Human eye. How are we able to see nearby as well as distant objects?
Which of the following statements is correct regarding rods and cones in the human eye?
Which of the following is responsible for the adjustment of the size of pupil?
