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.

NCERT Class 8 Science — Chapter 4: Light

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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?

Official previous-year question

Verified 1 Aug 2026.

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

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

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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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Which one of the following terms describes the phenomenon where the left of an object appears on the right in a mirror image?

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With reference to reflection from different surfaces, consider the following statements: 1. Regular reflection occurs when parallel rays fall on an irregular surface. 2. Diffused reflection occurs when parallel rays fall on an irregular surface and are reflected in different directions. 3. Diffused reflection is caused by irregularities in the reflecting surface. Which of the statements given above is/are correct?

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What is the primary optical mechanism that enables the visibility of non-luminous objects?

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The correct option is (b).

Explanation

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.