Advertisements
Advertisements
Question
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.
Solution
In the dark: Cells - rod cells, Pigment - rhodopsin
RELATED QUESTIONS
Differentiate between: Rods and cones
Explain the mechanism of vision.
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?
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?
Fill in the following blank with suitable word:
The part of eye which alters the size of the pupil is............
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?
What change is made in the eye to enable it to focus on objects situated at different distances? Illustrate your answer with the help of diagrams.
What happens to the eye when you enter a darkened cinema hall from bright sunshine? Give reason for your answer.
What happens to the size of pupil of our eye (i) in dim light (ii) in bright light?
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.
Mention the characteristics of the image that falls on the retina of the eye.
Name the following:
The opening through which light enters the eyes.
Name the following:
The focal length of the lens is altered by the contraction of which type of muscles.
Name the following:
The part of the eye responsible for change in the size of the pupil.
Write the name.
The screen with light sensitive cells in human eye.
The image of an object at an infinite distance is obtained in a real and erect form through a convex magnifying glass.
What kind of lens is there in our eyes? Where does it form the image of an object?
State the functions of the following:
Ciliary muscles
