Advertisements
Advertisements
प्रश्न
There are two types of light-sensitive cells in the human eye:
To what is each type of cell sensitive?
उत्तर
There are two types of light-sensitive cells in the human eye.
The rods (rod-shaped cells) present in the retina are sensitive to dim light and are responsible for vision in dim light.
The cones (cone-shaped cells) present in the retina are sensitive to bright or normal light and are responsible for colour discrimination and colour vision.
APPEARS IN
संबंधित प्रश्न
Write the function of the following part of the human eye: ciliary muscles
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.
Fill in the following blank with suitable word:
The iris controls the amount of................entering the eye.
Fill in the following blank with suitable word:
To bring light from a near object to a focus on the retina of the eye, the convex eye-lens need to be made....................
To focus the image of a nearby object on the retina of an eye:
(a) the distance between eye-lens and retina is increased
(b) the distance between eye-lens and retina is decreased
(c) the thickness of eye-lens is decreased
(d) the thickness of eye-lens is increased
Name the following:
The innermost layer of the eye
State the Function:
Visual purple
Why the human eye is compared with camera?
Given below is a diagram depicting a defect of the human eye. Answer the questions that follow:
- Give the scientific term for the defect.
- Mention one possible reason for the defect.
- What type of lens can be used to correct the defect?
Which one of the following statements is NOT correct?