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प्रश्न
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Iris
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संबंधित प्रश्न
How does the eye regulate the amount of light that falls on the retina?
How does the eye regulate the amount of light that falls on the retina?
Out of rods and cones m the retina of your eye:
which work in dim light?
Name the part of our eyes which helps us to focus near and distant objects in quick succession.
Fill in the following blank with suitable word:
The part of eye sensitive to light is...................
There are two types of light-sensitive cells in the human eye:
Where are they found?
What are rods and cones in the retina of an eye? Why is our night vision relatively poor compared to the night vision of an owl?
Which part brings the image into sharp focus on the retina? How does it do this?
Nocturnal animals (animals which sleep during the day and come out at night) tend to have wide pupils and lot of rods in their retinas. Suggest reasons for this.
With both eyes open, a person's field of view is about:
(a) 90°
(b) 150°
(c) 180°
(d) 360°
The region in the eyes where the rods and cones are located is the
Mention if the following statement is true (T) or false (F) Give reason.
yellow spot of the retina is the region of colour vision
With reference to the functioning of the eye, answer the question that follow:
Name the cells of the retina and its respective pigments which get activated in the dark.
Give scientific reason:
One can sense colours only in bright light.
Mention, if the following statement is True or False
Cones are the receptor cells in the retina of the eye sensitive to dim light.
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?
A tiny mirror M is fixed on a piece of cardboard placed on a table. The cardboard is illuminated by light from a bulb. The position of eye with respect to position of bulb is shown in the figure as A, B, C and D. In which position mirror will be visible?
 |
 |
 |
 |
| (A) | (B) | (C) | (D) |
Boojho while waving his hand very fast in front of his eyes, observes that his fingers appear blurred. What could be the reason for it?
Match the following:
| Column - I | Column - II |
| 1. Retina | a. Path way of light |
| 2. Pupil | b. Far point comes closer |
| 3. Ciliary muscles | c. near point moves away |
| 4. Myopia | d. Screen of the eye |
| 5. Hypermetropia | e. Power of accommodation |
With reference to human eye, answer the following question.
What is blind spot?
