NCERT Solutions for Class 10 Science Chapter 10 Light – Reflection and Refraction Page 168 or Page 171 or Page 176 or Page 184 or Exercises in English Medium or पेज 185 or पेज 188 or पेज 194 or पेज 203 or अभ्यास के प्रश्न उत्तर in हिंदी माध्यम to view online or download free in PDF form. Download Apps for offline use.
| Class: | 10 |
| Subject: | Science – विज्ञान |
| Chapter: | Light – Reflection and Refraction |
Table of Contents
- 1 NCERT Solutions for Class 10 Science Chapter 10
- 1.0.1 English Medium
- 1.0.1.1 Hindi Medium
- 1.0.1.2 10 Science Chapter 10 Page 168 Answers
- 1.0.1.3 10 Science Chapter 10 Page 171 Answers
- 1.0.1.4 10 Science Chapter 10 Page 176 Answers
- 1.0.1.5 10 Science Chapter 10 Page 184 Answers
- 1.0.1.6 10 Science Chapter 10 Exercises Answers
- 1.0.1.7 10 विज्ञान पाठ 10 पेज 185 के उत्तर
- 1.0.1.8 10 विज्ञान पाठ 10 पेज 188 के उत्तर
- 1.0.1.9 10 विज्ञान पाठ 10 पेज 194 के उत्तर
- 1.0.1.10 10 विज्ञान पाठ 10 पेज 203 के उत्तर
- 1.0.1.11 10 विज्ञान पाठ 10 अभ्यास के प्रश्न उत्तर
- 1.0.2 Important Questions from Light – Reflection and Refraction
- 1.0.3 Define the principal focus of a concave mirror.
- 1.0.4 The radius of curvature of a spherical mirror is 20 cm. What is its focal length?
- 1.0.5 Name the mirror that can give an erect and enlarged image of an object.
- 1.0.6 Why do we prefer a convex mirror as a rear-view mirror in vehicles?
- 1.0.7 A ray of light travelling in air enters obliquely into water. Does the light ray bend towards the normal or away from the normal? Why?
- 1.0.8 The refractive index of diamond is 2.42. What is the meaning of this statement?
- 1.0.9 Define 1 dioptre of power of a lens.
- 1.0.1 English Medium
NCERT Solutions for Class 10 Science Chapter 10
NCERT solutions for class 10 other subjects are also in PDF as well as online to use.
Go back to Class 10 Science Solutions Main page
English Medium
- View Online Page 168 Answers
- Download Page 168 in PDF
- View Online Page 171 Answers
- Download Page 171 in PDF
- View Online Page 176 Answers
- Download Page 176 in PDF
- View Online Page 184 Answers
- Download Page 184 in PDF
- View Online Exercises Answers
- Download Exercises in PDF
- NCERT Book Chapter 10
- Study Material
- Revision Book for 2019-20 Board Examination English Medium
Hindi Medium
- View Online पेज 185 के उत्तर
- Download पेज 185 in PDF
- View Online पेज 188 के उत्तर
- Download पेज 188 in PDF
- View Online पेज 194 के उत्तर
- Download पेज 194 in PDF
- View Online पेज 203 के उत्तर
- Download पेज 203 in PDF
- View Online अभ्यास के प्रश्न उत्तर
- Download अभ्यास in PDF
- NCERT की किताब अध्याय 10
- Revision Book for 2019-20 Board Examination Hindi Medium
Go back to Class 10 Science Solutions Main page
10 Science Chapter 10 Page 168 Answers
NCERT Solutions for Class 10 Science Chapter 10 Intext questions on page 168 are given below. For other questions, please visit to Page 171 or Page 176 or Page 184 or Exercises or go for हिंदी माध्यम Solutions. Visit Class 10 Science main page or Top of the page.
10 Science Chapter 10 Page 171 Answers
10 Science Chapter 10 page 171 are given below. For other questions, please visit to Page 168 or Page 176 or Page 184 or Exercises or go for हिंदी माध्यम Solutions. Visit Class 10 Science main page or Top of the page.
10 Science Chapter 10 Page 176 Answers
NCERT Solutions for Class 10 Science Chapter 10 page 176 answers are given below. For other questions, please visit to Page 168 or Page 171 or Page 184 or Exercises or go for हिंदी माध्यम Solutions. Visit Class 10 Science main page or Top of the page.
10 Science Chapter 10 Page 184 Answers
Solutions for Class 10 Science Chapter 10 Light – Reflection and Refraction Intext questions on page 184 are given below. For other questions, please visit to Page 168 or Page 171 or Page 176 or Exercises or go for हिंदी माध्यम Solutions. Visit Class 10 Science main page or Top of the page.
10 Science Chapter 10 Exercises Answers
NCERT Solutions for Class 10 Science Chapter 10 Light – Reflection and Refraction Exercises answers are given below. For other questions, please visit to Page 168 or Page 171 or Page 176 or Page 184 or go for हिंदी माध्यम Solutions. Visit Class 10 Science main page or Top of the page.
10 विज्ञान पाठ 10 पेज 185 के उत्तर
NCERT Solutions for Class 10 Science Chapter 10 Light – Reflection and Refraction Intext questions on page 185 are given below. For other questions, please visit to पेज 188 or पेज 194 or पेज 203 or अभ्यास के प्रश्न उत्तर or go for English Medium Solutions. Visit Class 10 Science main page or Top of the page.
10 विज्ञान पाठ 10 पेज 188 के उत्तर
10 Science Chapter 10 page 188 answers are given below. For other questions, please visit to पेज 185 or पेज 194 or पेज 203 or अभ्यास के प्रश्न उत्तर or go for English Medium Solutions. Visit Class 10 Science main page or Top of the page.
10 विज्ञान पाठ 10 पेज 194 के उत्तर
Class 10 Science Chapter 10 Intext questions on page 194 are given below. For other questions, please visit to पेज 185 or पेज 188 or पेज 203 or अभ्यास के प्रश्न उत्तर or go for English Medium Solutions. Visit Class 10 Science main page or Top of the page.
10 विज्ञान पाठ 10 पेज 203 के उत्तर
NCERT Solutions for Class 10 Light – Reflection and Refraction Intext questions on page 203 are given below. For other questions, please visit to पेज 185 or पेज 188 or पेज 194 or अभ्यास के प्रश्न उत्तर or go for English Medium Solutions. Visit Class 10 Science main page or Top of the page.
10 विज्ञान पाठ 10 अभ्यास के प्रश्न उत्तर
NCERT Solutions for Class 10 Science Chapter 10 Light – Reflection and Refraction अभ्यास के प्रश्न उत्तर are given below. For other questions, please visit to पेज 185 or पेज 188 or पेज 194 or पेज 203 or go for English Medium Solutions. Visit Class 10 Science main page or Top of the page.
Visit Class 10 Science main page or Top of the page
Important Questions from Light – Reflection and Refraction
Class 10 Science – Physics
Question 1:
Give three points of difference between real and virtual images.
Answer 1:
Real Image:
(i) Here the rays actually meet at the image point.
(ii) It can be taken on a screen.
(iii) It is always inverted
Virtual Image:
(i) Here the rays appear to diverge from the image point.
(ii) It cannot be taken on a screen.
(iii) It is always erect.
Question 2:
Distinguish between a concave and convex lens.
Answer 2:
Convex lens
(a) It is thicker at the centre than at the edges.
(b) It converges a parallel beam of light on refraction through it.
(c) It has a real focus.
Concave lens:
(a) It is thinner at the centre than at the edges.
(b) It diverges a parallel beam of light on refraction through it.
(c) It has a virtual focus.
Question 3:
List four properties of the image formed by a plane mirror.
Answer 3:
Properties of images formed by a plane mirrors:
(i) The image formed by a plane mirror is virtual and erect.
(ii) It is of the same size as the object.
(iii) The image is formed as far behind the mirror as the object is in front of it i.e., u = v.
(iv)It is laterally inverted i.e., image is inverted sideways with respect to the object.
Question 4:
List the four properties of the image formed by a convex mirror.
Answer 4:
Properties of the image formed by a convex mirror:
(i) This image is always virtual and erect.
(ii) The image is highly diminished or point sized.
(iii) It is always formed between F and P.
(iv) As the object is moved towards the pole of convex mirror, image also moves towards its pole and gradually increases size till its size becomes almost equal to that of the object.
More Questions for Exams
Question 1:
Define the principal focus of a concave mirror. Calculate the focal length of the mirror of radius of curvature of 20 cm.
Answer 1:
The principal focus of concave mirror is a point on its principal axis at which a beam of light parallel to the principal axis actually converges after reflection from the mirror.
Focal length = R/2 = 20/2 = 10 cm.
Question 2:
State the type of mirror preferred as (i) rear view mirror in vehicles, (ii) shaving mirror. Justify your answer giving two reason in each case.
Answer 2:
(i) A convex mirror is preferred as a rear-view mirror because
(a) It always forms an erect, virtual and diminished image of an object placed anywhere in front of it.
(b) It has wider field of view.
(ii) A concave mirror is preferred as a shaving mirror because when it is held closer to the face, it form:
(a) an enlarged image of the face
(b) an erect image of the face
Question 3:
State the laws of refraction of light.
Answer 3:
Laws of refraction of light: The refraction of light obeys the following two laws:
First law: The incident ray, the refracted ray and normal to the surface of separation at the point of incidence, all lie in the same plane.
Second law: The ratio of the sine of the angle of incidence and the sine of the angle of refraction is constant for a given pair of media. Mathematically,
[sin i] / [sin r] = n (a constant).
The ratio n2 is called refractive index of the second medium with respect to the first medium. The second law of refraction is also called Snell’s law of refraction.
Question 4:
What is meant by refraction of light?
Answer 4:
Refraction of light: The phenomenon of bending of light from its straight line path as it passes obliquely from one transparent medium to another is called refraction of light.
The path of the ray of light in the first medium is called incident ray.
The path of the ray of light in the second medium is called refracted ray.
The angle between the incident ray and the normal at the surface of separation is called angle of incidence (i).
The angle between the refracted ray and the normal at the surface of separation is called angle of refraction (r).
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Table of Contents
- 1 Define the principal focus of a concave mirror.
- 2 The radius of curvature of a spherical mirror is 20 cm. What is its focal length?
- 3 Name the mirror that can give an erect and enlarged image of an object.
- 4 Why do we prefer a convex mirror as a rear-view mirror in vehicles?
- 5 A ray of light travelling in air enters obliquely into water. Does the light ray bend towards the normal or away from the normal? Why?
- 6 The refractive index of diamond is 2.42. What is the meaning of this statement?
- 7 Define 1 dioptre of power of a lens.
Define the principal focus of a concave mirror.
The radius of curvature of a spherical mirror is 20 cm. What is its focal length?
Radius of curvature of a spherical mirror = 2 × Focal length (f)
R = 2f
f = r/2 = 20/2 = 10 cm
Hence, the focal length of the given spherical mirror is 10 cm.
Name the mirror that can give an erect and enlarged image of an object.
Why do we prefer a convex mirror as a rear-view mirror in vehicles?
A ray of light travelling in air enters obliquely into water. Does the light ray bend towards the normal or away from the normal? Why?
When a ray of light travels from an optically rarer medium to an optically denser medium, it gets bent towards the normal. Since water is optically denser than air, a ray of light travelling from air into the water will bend towards the normal.
The refractive index of diamond is 2.42. What is the meaning of this statement?
n = c/v
Where, c is the speed of light in vacuum/air
The refractive index of diamond is 2.42. This suggests that the speed of light in diamond will reduce by a factor 2.42 compared to its speed in air.
Define 1 dioptre of power of a lens.
P = 1/f
The S.I. unit of power of a lens is Dioptre. It is denoted by D.
1 dioptre is defined as the power of a lens of focal length 1 metre.
1 D = 1 per meter