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?

The correct option is (c). Explanation Reflection is categorized into regular (specular) and diffused (irregular) reflection based on the smoothness of the reflecting surface. The fundamental laws of reflection apply to every point on the surface in both cases. Statement-wise Analysis: - Statement 1 is Incorrect. Regular reflection occurs when a parallel beam of light falls on a smooth and polished surface, such as a plane mirror. In this process, the entire beam is reflected in one specific direction, remaining parallel. It does not occur on irregular surfaces. - Statement 2 is Correct. Diffused reflection takes place when parallel rays of light strike a rough or irregular surface (e.g., a wall, paper, or wood). Due to the surface texture, the reflected rays are scattered in many different directions rather than remaining parallel. - Statement 3 is Correct. Diffused reflection is directly caused by the irregularities of the reflecting surface. On a rough surface, the orientation of the normal varies at different points. Therefore, while the angle of incidence equals the angle of reflection at each individual point, the collective reflected rays travel in random directions. Key Takeaway: Regular reflection occurs on smooth surfaces and preserves the parallel nature of light beams, while diffused reflection occurs on rough surfaces and scatters light, which allows non-luminous objects to be visible from multiple angles.

With reference to reflection from different… - NCERT Class 8 Science MCQ

NCERT Class 8 Science — Chapter 4: Light

mcqmedium

With reference to reflection from different surfaces, consider the following statements:

Regular reflection occurs when parallel rays fall on an irregular surface.
Diffused reflection occurs when parallel rays fall on an irregular surface and are reflected in different directions.
Diffused reflection is caused by irregularities in the reflecting surface.

Which of the statements given above is/are correct?

NCERT textbook question

From NCERT Science - class 8 · Page 168

Options

A1 and 2 only
B2 only
C2 and 3 only
D1, 2 and 3

Did you get this right?

Solution

The correct option is (c).

Explanation

Reflection is categorized into regular (specular) and diffused (irregular) reflection based on the smoothness of the reflecting surface. The fundamental laws of reflection apply to every point on the surface in both cases.

Statement-wise Analysis:

Statement 1 is Incorrect. Regular reflection occurs when a parallel beam of light falls on a smooth and polished surface, such as a plane mirror. In this process, the entire beam is reflected in one specific direction, remaining parallel. It does not occur on irregular surfaces.
Statement 2 is Correct. Diffused reflection takes place when parallel rays of light strike a rough or irregular surface (e.g., a wall, paper, or wood). Due to the surface texture, the reflected rays are scattered in many different directions rather than remaining parallel.
Statement 3 is Correct. Diffused reflection is directly caused by the irregularities of the reflecting surface. On a rough surface, the orientation of the normal varies at different points. Therefore, while the angle of incidence equals the angle of reflection at each individual point, the collective reflected rays travel in random directions.

Key Takeaway: Regular reflection occurs on smooth surfaces and preserves the parallel nature of light beams, while diffused reflection occurs on rough surfaces and scatters light, which allows non-luminous objects to be visible from multiple angles.

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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