With reference to the 'Blind Spot', consider the following statements: 1. It is located at the center of the cornea. 2. It has no sensory cells. 3. An image formed here is sent to the brain very slowly. Which of the statements given above is/are correct?

The correct option is (b). Explanation The human eye functions as a natural optical instrument where the retina serves as the screen for image formation. The optic nerve transmits visual signals from the retina to the brain for processing. - Statement 1 is Incorrect: The blind spot is located on the retina, specifically at the junction where the optic nerve leaves the eye and retinal blood vessels enter it. It is not located on the cornea, which is the transparent anterior part of the eye. - Statement 2 is Correct: The blind spot is characterized by the complete absence of photoreceptor cells (rods and cones). Due to the lack of these light-sensitive cells, light falling on this specific area cannot be detected. - Statement 3 is Incorrect: Since there are no sensory cells to detect light, no image is formed or perceived at the blind spot. Therefore, no visual signal is sent to the brain from this point. The brain typically compensates for this gap by filling in visual information based on surrounding details and input from the other eye. Key Takeaway: The blind spot is the specific area on the retina where the optic nerve exits the eye; it is devoid of rods and cones, rendering it incapable of detecting visual stimuli.

With reference to the 'Blind Spot',… - NCERT Class 8 Science MCQ

NCERT Class 8 Science — Chapter 4: Light

mcqmedium

With reference to the 'Blind Spot', consider the following statements:

It is located at the center of the cornea.
It has no sensory cells.
An image formed here is sent to the brain very slowly.

Which of the statements given above is/are correct?

NCERT textbook question

From NCERT Science - class 8 · Page 172

Options

A1 only
B2 only
C1 and 3 only
D1, 2 and 3

Did you get this right?

Solution

The correct option is (b).

Explanation

The human eye functions as a natural optical instrument where the retina serves as the screen for image formation. The optic nerve transmits visual signals from the retina to the brain for processing.

Statement 1 is Incorrect: The blind spot is located on the retina, specifically at the junction where the optic nerve leaves the eye and retinal blood vessels enter it. It is not located on the cornea, which is the transparent anterior part of the eye.
Statement 2 is Correct: The blind spot is characterized by the complete absence of photoreceptor cells (rods and cones). Due to the lack of these light-sensitive cells, light falling on this specific area cannot be detected.
Statement 3 is Incorrect: Since there are no sensory cells to detect light, no image is formed or perceived at the blind spot. Therefore, no visual signal is sent to the brain from this point. The brain typically compensates for this gap by filling in visual information based on surrounding details and input from the other eye.

Key Takeaway: The blind spot is the specific area on the retina where the optic nerve exits the eye; it is devoid of rods and cones, rendering it incapable of detecting visual stimuli.

Your note

More from Chapter 4: Light

With reference to the Periscope, consider the following statements: 1. It works on the principle of multiple reflections. 2. It uses two plane mirrors arranged at right angles to each other. 3. It allows viewing of objects that are not directly in the line of sight. Which of the statements given above are correct?

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With reference to image formation by a plane mirror, consider the following statements: 1. The image formed cannot be obtained on a screen. 2. The image appears at a greater distance behind the mirror than the object is in front. 3. The image undergoes lateral inversion. Which of the statements given above are correct?

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Consider the following statements about the image formed by a plane mirror: 1. It is inverted vertically. 2. It is of the same size as the object. 3. It appears to be at the same distance behind the mirror as the object is in front. Which of the statements given above is/are correct?

easy

In the context of the reflection of light, what does the term 'angle of incidence' refer to?

easy

With reference to the eye's ability to see, consider the following statements: 1. A normal eye can clearly see distant objects as well as objects nearby. 2. The minimum distance for distinct vision is constant at 50 cm for all ages. 3. In old age, eyesight may become foggy due to the eye lens becoming cloudy. Which of the statements given above is/are correct?

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