Retina

Q.

In the human eye, the image of an object is formed at______.

Q.

Explain the structure of the human eye.

Q.

Pigmented layer in the eye is called as

1. Choroid

2. Cornea

3. Sclerotic

4. Eyelids

Q.

Can we see virtual images$?$

Q.

Name the part of eye on which the image of the object is formed by the eye lens?

1. retina

2. ciliary muscle

3. optic nerve

4. vitreous humour

Q. There are two types of light-sensitive cells in the human eye :
(a) Where are they found ?
(b) What is each type called ?
(c) To what is each type of cell sensitive ?

Q.

Why do cat's eyes glow in the dark?

1. Cat's cornea reflects all the light falling on it and allow very less amount of light to go inside.

2. The retina of cat's eye has a layer just behind it that reflects the light falling and so they appear to be glowing.

3. Cat's have a pigment on their cornea, that shines when illuminated by light.

4. Cat's eyes are covered with an additional reflective layer.

Q.

The image formed in the retina is inverted.All REAL Images are inverted.

How our brain shows the eye the normal image of the world?

Ex : If one man is tighed upside down for some days using rope, after some days he can see the normal world or the tilted world.

Q.

How do we see things upright if the image formed on retina in our eye is an inverted one.

Q.

Part of the eye which controls the light entering is called?

1. Iris

2. Cornea

3. Lens

4. Retina

Q. 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

Q.

Describe the function of rods and cones of eyes

Q.

The cones of the eyes are sensitive to

1. color.

2. the intensity of light.

3. frequency of light.

4. none of these

Q.

Name the part of the retina which is insensitive to light.

Q. Give reason:
One can sense colours only in bright light.

Q.

What is the name of :
(a) the curved, transparent front surface of the eye ?
(b) the light-sensitive layer in the eye ?

Q.

State whether the following statement is true or false :
The image formed on our retina is upside-down

Q.

Colour of the eye like blue or black is due to

1. Sclera

2. Choroid

3. Retina

4. Iris

Q.

The screen behind the eye lens is called the

1. iris

2. ciliary muscle

3. retina

4. pupil

Q. What are rods and conces in the retina of an eye ? Why is our night vision relatively poor compared to the night vision of an owl ?

Q.

What is the near point of a normal human eye?

Q.

What is the importance of blind spot in our eyes

Q.

The cone-shaped cells on the retina are sensitive to red, blue, and green colors to different extents.

1. True
2. False

Q.

Under the very dim light, we are able to see the objects but cannot distinguish between colors. Why?

Q.

The organ through which light enters in our eye is known as

1. Cornea

2. iris

3. Pupil

4. Retina

Q.

What is the nature and size of the image formed on retina??

Is it same size of the object of yes then explain ?

Q.

Name the three layers of tissues of a human eye.

Q. Electrical signals generated by light-sensitive cells are sent to the brain via the optic nerves.

1. True
2. False

Q. In our eye, image is formed at _______.

1. ciliary muscles
2. cornea
3. retina
4. crystalline lens

Q.

Identify the part of the human eye where rod cells and cone cells are located

1. Cornea

2. Retina

3. Choroid

4. Sclera