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प्रश्न
An aperture that controls the passage of light into the eye is ______.
विकल्प
Blind spot
Pupil
Yellow spot
Iris
उत्तर
An aperture that controls the passage of light into the eye is pupil.
Explanation:
The pupil constricts (gets narrower) to reduce the amount of light entering the eyes.
संबंधित प्रश्न
Draw a neat and labelled diagram of the structure of the human eye.
The optical prescription for a pair of spectacles is :
Right eye : −3.50 D
Left eye : −4.00 D
Which lens has a greater focal length?
Out of rods and cones m the retina of your eye:
which detect colour?
The eyes of a person are focused (i) on a nearby object, and (ii) on a distant object, turn by turn. In which case:
the focal length of eye-lens will be the maximum?
Explain why, when it is getting dark at night, it is impossible to make out the colour of cars on the road.
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.
Name two animals having eyes:
at the front of the head.
State the function of each of the following parts of the human eye:
(i) Cornea
(ii) Iris
(iii) Pupil
(iv) Retina
Millions of people of the developing countries are suffering from corneal blindness. This disease can be cured by replacing the defective cornea with the cornea of a donated eye. Your school has organised a campaign in the school and its neighbourhood in order to create awareness about this fact and motivate people to donate their eyes after death. How can you along with your classmates contribute in this noble cause? State the objectives of organising such campaigns in schools.
Name the respective organs in which the following are located and mention the main function of each:
(i) Iris
(ii) Semicircular canals
Name the following:
The opening through which light enters the eyes.
Choose the correct answer :
The rods and cones of a vertebrate retina function is to _________
State the Location:
Iris
The image of the object in the human eye is formed on the cross screen.
Draw the struture of human eye and label its parts.
Shylesh is a school-going kid studying standard VIII. He is crazy about playing video games on mobile phones. After a couple of months, his eyes turned red and he felt severe pain in his eyes. His science teacher enquired about this and advised his parents to take him to an eye doctor.
- How does excessive usage of mobile phone affect our eyes?
- What are the values shown by the teacher?
The pigmented circular area seen in front of the eye:
With neat, labeled diagram describe the structure of retina of 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
Which of the following is responsible for the adjustment of the size of pupil?
