Eye Mechanism

Q.

What is the nature of image formed on the retina of the eye?

1. real and erect

2. virtual and inverted

3. virtual and erect

4. real and inverted

Q.

Explain luminous and illuminated objects with examples. [3 MARKS]

Q.

Where is the image formed inside the eye of a person with normal vision?

1. In front of the retina

2. Behind the retina

3. On the iris

4. On the retina

Q.

The retina is at a distance of about_________ from the eye lens.

1. $1mm$

2. $1cm$

3. $2cm$

4. $5cm$

Q. Choose the correct answer regarding luminous objects:

Statement 1: Objects which emit light on their own are known as luminous objects.
Statement 2: Luminous objects are responsible for our vision.
Statement 3: Candle and earth are examples of luminous objects.
Statement 4: Luminous objects emit their own light and also reflects the light falling on them from other light sources.

1. Only statement 1 is correct

2. Only Statement 1, 2 and 4 are correct

3. Only statement 1 and 4 are correct

4. All the statements are correct

Q. The size of an object as perceived by an eye depends primarily on

1. actual size of the object
2. intensity of light
3. size of the image formed on the retina
4. aperture of the pupil

Q. An object that completely allows light to pass through is called a object.

1. transparent
2. translucent
3. luminous

Q. What is called as the range of vision of the eye?

1. Farthest point up to which the eye can see clearly
2. Distance between near point and far point
3. Nearest point up to which the eye can see clearly
4. None of these

Q.

What is the near point of healthy vision?

1. 25 cm

2. 30 cm

3. 15 cm

4. 20 cm

Q.

Which of the following best depicts how we see objects?

1. 

2. 

3. 

4. 

Q.

Regeneration of rhodopsin or the purplish pigment in the dark is called

1. Dark adaptation

2. Light adaptation

3. Squint

4. After-image

Q.

Which of the following equipment works on a similar principle as human eye?

1. Telescope

2. Gun

3. none of these

4. camera

Q.

When light enters the human eye, it first reaches ___ , then ___ and finally it reaches the ___ .

1. cornea, crystalline Lens, retina
2. retina, crystalline lens, cornea
3. crystalline lens, cornea, retina
4. retina, pupil, iris

Q.

Eye is more sensitive to

1. red light

2. blue light

3. green-red region of the spectrum

4. yellow-green region of the spectrum

Q.

A real image is formed on a screen, the retina of the eye, etc.

1. True
2. False

Q.

If a person is reading a novel, then in what condition are his ciliary muscles?

1. Expanded

2. None of these

3. Contracted

4. do not change

Q.

When the ciliary muscles are relaxed, then the focal length of the eye lens ___.

1. first increases then decreases

2. remains constant

3. increases

4. decreases

Q.

Which of the following equipment works on similar principle as human eye?

1. Gun

2. Microscope

3. Telescope

4. Camera