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CBSE Class 10 Science Chapter 10 Light-Reflection and Refraction Revision Notes

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CBSE Class 10 Science Chapter 10 Light-Reflection and Refraction Revision Notes

 

Revision is one of the most important aspects of learning as it helps you to remember facts, figures, and topics that you have covered earlier. Students are always advised to summarize whatever they have learned as Revision Notes. CBSE Class 10 Science Chapter 10 Light-Reflection and Refraction Revision Notes are very crucial for the students of 10th class to clear their doubts and excel in their examination.

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Reflection

 

Reflection is the change in the direction of a wavefront, at an interface between
two different media, so that the wavefront returns into the medium from which it originated. Reflection of light is either specular (reflects all light at the same angle) or diffuse (reflects in a broad range of directions) depending on the nature of the interface.

 

Example:

▪ A mirror provides the most common model for specular light reflection.
▪ Matte paints have almost exclusively diffuse reflection, while glossy paints have both specular and diffuse reflection.

 

Reflection of Light

 

There are some surfaces that have the ability to send the light back in the
same medium when light strikes it. This phenomenon of sending the light back in the same medium by a surface is called a reflection of light.

 

Laws of Reflection:

1. The incident ray, the reflected ray, and the normal to the surface at the point of incidence, all lie in the same plane.

2. The angle of incidence is always equal to the angle of reflection, i = ∠r.

▪ θ reflection=θ incidence
▪ The plane of the incident ray reflected ray and normal at the point of incidence is the same

3. The reflected ray and the incident ray are on the opposite sides of the normal.

 

Refraction

 

Refraction can be defined as the change in the direction of wave propagation due to a change in its transmission medium. This phenomenon is explained by the conservation of energy and the conservation of momentum. Due to the change of medium, the phase velocity of the wave is changed but its frequency remains constant. This is most commonly observed when a wave passes from one medium to another at any angle other than 0° from the normal. Even though refraction of light is the most commonly observed phenomenon, any type of wave can refract when it interacts with a medium,

 

 

Refraction of light:

 

The bending of a ray of light when it passes from one medium to another is
called refraction of light.

 

Laws of Refraction (Snell’s Law):

1. The incident ray, the refracted ray, and the normal at the point of incidence all lie in the same plane.
2. If a ray of light undergoes refraction then, the ratio of the sine of the angle of incidence to the sine of the angle of refraction is constant. Constant = refractive index of the second medium with respect to the first.

 

 

CBSE Class 10 Science Chapter 10 Light-Reflection and Refraction Revision Notes PDF

 

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