SEBA Class 10 Science Important Chapter 10 Light-Reflection and Refraction

SEBA Class 10 Science Important Chapter 10 Light-Reflection and Refraction Solutions English Medium As Per SEBA New Syllabus to each chapter is provided in the list so that you can easily browse through different chapters NCERT Class 10 Science Additional Solutions in English and select need one. SEBA Class 10 General Science Additional Notes English Medium Download PDF. SEBA Important Solutions for Class 10 Science.

SEBA Class 10 Science Important Chapter 10 Light-Reflection and Refraction

Also, you can read the NCERT book online in these sections Solutions by Expert Teachers as per Central Board of Secondary Education (CBSE) Book guidelines. Assam SEBA Board Class 10 General Science Additional Question Answer are part of All Subject Solutions. Here we have given NCERT Class 10 Science Important Question Answer English Medium for All Chapters, You can practice these here.

Light-Reflection and Refraction

Chapter: 10

IMPORTANT QUESTION ANSWER

Q.1. Define luminous objects.

Ans: Luminous objects are those which emit light on their own. They won’t take the help of other objects to emit the light. 

Q.2. Define non-luminous objects. Give example. 

Ans: A non-luminous object is one that does not produce its own light, although it can still reflect light from other sources.

Examples: Chair, table, book, human bings, mirror etc. 

Q.3. Write the laws of reflection. 

Ans: The laws of reflection are:

1. The first law of reflection states that the incident ray, the reflected ray, and the normal to the surface of the mirror, all lie in the same plane.

2. The angle of reflection is always equal to the angle of incidence.

Q.4. What do you mean by lateral inversion? 

Ans: Lateral inversion” means the apparent reversal of the mirror image’s left and right when compared with the object. This change of sides of an object and its mirror image is called lateral inversion. 

Q.5. What are the characteristics of an image formed by a plane mirror? 

Ans: The characteristics are: 

1. Plane mirror forms an erect image.

2. The image formed in a plane mirror is erect. It is the same side up as the object. 

3. Image is formed at the same distance behind the mirror as the object stands in front of it

4. Size of the image is same as that of the object. 

5. It forms a virtual image. 

Q.6. What happens when a ray of light falls normally or perpendicularly on the surface of a plane mirror? 

Ans: As ray of light falls normally on mirror this means that angle of incidence is 0o. From second law of reflection we know that angle of incidence is equal to angle of reflection. So angle of reflection will also be zero. Therefore the light ray will be reflected back along the same path.

Q.7. A ray of light is incident normally on a plane mirror. What will be the: 

(a) Angle of incidence?

Ans: 0° 

(b) Angle of reflection? 

Ans: 0°

Q.8. Define the following for a spherical mirror: 

(a) Pole.

Ans: The centre of a spherical mirror is called its pole.

(b) Principal axis.

Ans: The straight line passing through the centre of curvature and pole of a spherical mirror is called its principal axis.

(c) Focal length. 

Ans: The focal length of a concave mirror is the distance between its pole and principal focus.

Q.9. Name the spherical mirror which has: 

(a) Virtual principal focus.

Ans: Convex mirror.

(b) Real principal focus.

Ans: Concave mirror.

Q.10. Define refraction of light. Write the laws of refraction. 

Ans: The phenomenon of change in the direction of light when it passes from one transparent medium to another is called refraction.

Laws of refraction are:

(i) The incident ray, the refracted ray and the normal to the interface of two transparent media at the point of incidence, all lie in the same plane.

(ii) The ratio of sine of angle of incidence to the sine of angle of refraction is a constant, for the light of a given colour and for the given pair of media. This law is also known as Snell’s law of refraction.