Advertisements
Advertisements
प्रश्न
Define the following:
Blind spot
उत्तर
Blind spot - It is the region of no image formation because of lack of cone cells.
APPEARS IN
संबंधित प्रश्न
Write short notes on the following: 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?
What kind of lens is present in the human eye?
What is the name of:
the light-sensitive layer in the eye?
Fill in the following blank with suitable word:
To bring light from a distant object to a focus on the retina of the eye, the convex eye-lens needs to be made..........
What changes take place in the shape of eye-lens:
when the eye is focused on a near object?
Name the cells on the retina of an eye which are sensitive to (i) bright light (ii) dim light (iii) sensation of colour.
How does the eye adjust itself to deal with light of varying intensity?
Which parts of the eye cause rays of light to converge on the retina?
Why does the eye-lens not have to do all the work of converging incoming light rays?
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
Mention if the following statement is true (T) or false (F) Give reason.
yellow spot of the retina is the region of colour vision
Write whether the following is true or false:
Rods are the receptor cells in the retina of the eye sensitive to dimlight.
Choose the correct answer.
Which one is the photoreceptor _____________
Choose the correct answer :
The rods and cones of a vertebrate retina function is to _________
Draw a labeled diagram of the front view of human eye.
| 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 accomodation |
Chris was watching the display of fireworks in the sky.
- Trace the path of the light rays using the following terms:
Fovea, Lens, Conjunctiva, Pupil, Cornea. - Name the nerve that carries the impulse for vision to the brain.
An aperture that controls the passage of light into the eye is ______.
Write the main functional activity of the following structure.
Choroid
