NCERT Solutions for Class 7 Science Chapter 15 Light

 

NCERT solutions for class 7 science chapter 15 Light: Learning through activities makes a chapter interesting. The chapter light has many activities which makes it very easy to understand. Along with these activities if you have solutions of NCERT class 7 science chapter 15 light in hand, then scoring good marks in the exam is an easy thing. The CBSE NCERT solutions for class 7 science chapter 15 light give an explanation for 13 questions and two of them are simple numerical problems. While going through this chapter you will come across concepts like the applications of concave mirror and lens, how the image is visible in a plane mirror, what are the properties of image formed by a plane mirror, convex and concave mirror and lens etc. The NCERT solutions for class 7 science chapter 15 light helps to understand these concepts well. While learning a chapter, first of all, try to answer all the questions by yourself. Then, if you need any help then refer to NCERT solutions for the respective chapters.

Here are the important topics of NCERT solutions for class 7 science chapter 15 light :

15.1 Light Travels Along a Straight Line

15.2 Reflection of Light

15.3 Right or Left!

15.4 Playing With Spherical Mirrors

15.5 Images Formed by Lenses

15.6 Sunlight — White or Coloured?

NCERT solutions for class 7 science chapter 15 light exercise:

2. Mark ‘T’ if the statement is true and ‘F’ if it is false:
(a) We can obtain an enlarged and erect image by a convex mirror. (T/F)
(b) A concave lens always form a virtual image. (T/F)
(c) We can obtain a real, enlarged and inverted image by a concave mirror. (T/F)
(d) A real image cannot be obtained on a screen. (T/F)
(e) A concave mirror always form a real image. (T/F
)

Answer:

(a)  False. As the size of the image formed is smaller.

(b)  True.

(c) True as the concave mirror gives a real and enlarged image. 

(d)  False. Real images can be obtained on screens whereas virtual images cannot be.

(e) False. As the nature of the image is decided by the distance between the object and mirror.

3. Match the items given in Column I with one or more items of Column II.                            
    

  Column I     

  Column II

(a) A plane mirror 

(i) Used as a magnifying glass.

 (b) A convex mirror

(ii) Can form an image of objects spread over a large area.

(c) A convex lens

(iii) Used by dentists to see an enlarged image of teeth.

 (d) A concave mirror

(iv) The image is always inverted and magnified.

 (e) A concave lens

(v) The image is erect and of the same size as the object.

 

(vi) The image is erect and smaller in size than the object.

Answer:

(a) The image formed by a plane mirror is erect and of the same size.

(b) The image formed by a concave mirror is inverted and magnified. Also, they can form images of objects spread over a large area. 

(c) A convex lens is used as magnifying glasses.

(d) A concave mirror is used to see enlarged images.

(e) The image formed by a concave lens is erect and smaller in size.

4. State the characteristics of the image formed by a plane mirror.

Answer:

An image formed by a plane mirror is:- 

(i) virtual

(ii) erect

(iii) of the same size

5. Find out the letters of the English alphabet or any other language known to you in which the image formed in a plane mirror appears exactly like the letter itself. Discuss your findings.

Answer:

The letter which has vertical symmetry will have this property.

In English alphabets, we have  A, H, I, M, O, T, U, W, X, X, Y that appears exactly like itself in the plane mirror.

6. What is a virtual image? Give one situation where a virtual image is formed.

Answer:

The image which can be screened (or obtained on screen) is known as a virtual image.

For e.g. in case of a candle which is placed in front of a plane mirror, we observe a virtual image of the candle formed behind the mirror. 

7. State two differences between a convex and a concave lens.

Answer:

The basic difference between the two are given below:- 

(i) In the case of a convex lens, it converges the falling rays of light whereas in the case of the concave lens the rays diverge.

(ii) A concave lens has thick edges and is thin at the middle but the convex lens is thick at the middle.

8. Give one use each of a concave and a convex mirror.

Answer:

The side-view mirror in a vehicle is a convex mirror for getting wider view of the rear.

To see an enlarged image of teeth, dentists use a concave mirror. 

9. Which type of mirror can form a real image?

Answer:

A concave mirror can form real images which can be obtained on the screen. The nature of the image formed by these mirrors depends upon the distance between the object and mirror.

10. Which type of lens forms always a virtual image?

Answer:

The images formed by a concave lens is always virtual, magnified and erect in nature.

11. A virtual image larger than the object can be produced by a
(i) concave lens                                 (ii) concave mirror
(iii) convex mirror                               (iv) plane mirror

Answer:

The correct answer is a concave mirror. The image formed by a concave mirror can be both virtual or real depending on the position of the object. Also, the image obtained is magnified.

12. David is observing his image in a plane mirror. The distance between the mirror and his image is 4 m. If he moves 1 m towards the mirror, then the distance between David and his image will be
  (i) 3 m       (ii) 5 m       (iii) 6 m      (iv) 8 m

Answer:

 We are given the distance between the mirror and his image = 4 m

Now, if David moves 1 m towards the mirror, then the distance is  = 4 − 1 = 3 m

Hence, the distance between David and his image is  = 3 + 3 = 6 m.

13. The rearview mirror of a car is a plane mirror. A driver is reversing his car at a speed of 2 m/s. The driver sees in his rear view mirror the image of a truck parked behind his car. The speed at which the image of the truck appears to approach the driver will be
(i) 1 m/s           (ii) 2 m/s    (iii) 4 m/s         (iv) 8 m/s

Answer:

We are given that the speed of the car is 2 m/s which implies, the car is approaching the truck with a speed of 2 m/s.

Hence the speed at which the image of the truck appears to approach the driver will be:   2\times2  =  4 m/s

Chapterwise NCERT solutions of class 7 science

Chapter No.

Chapter Name

Chapter 1  

NCERT solutions for class 7 science chapter 1 Nutrition in Plants

Chapter 2

Solutions of NCERT class 7 science chapter 2 Nutrition in Animals

Chapter 3

CBSE NCERT solutions for class 7 science chapter 3 Fibre to Fabric

Chapter 4

NCERT solutions for class 7 science chapter 4 Heat

Chapter 5

Solutions of NCERT class 7 science chapter 5 Acids Bases and Salts

Chapter 6

CBSE NCERT solutions for class 7 science chapter 6 Physical and Chemical Changes

Chapter 7

NCERT solutions for class 7 science chapter 7 Weather Climate and Adaptations of Animals to Climate

Chapter 8

Solutions of NCERT class 7 science chapter 8 Winds storms and cyclones

Chapter 9

CBSE NCERT solutions for class 7 science chapter 9 Soil

Chapter 10

NCERT solutions for class 7 science chapter 10 Respiration in Organisms

Chapter 11

Solutions of NCERT class 7 science chapter 11 Transportation in Animals and Plants

Chapter 12

CBSE NCERT solutions for class 7 science chapter 12 Reproduction in Plants

Chapter 13

NCERT solutions for class 7 science chapter 13 Motion and Time

Chapter 14

Solutions of NCERT class 7 science chapter 14 Electric Current and its Effects

Chapter 15

CBSE NCERT solutions for class 7 science chapter 15 Light

Chapter 16

NCERT solutions for class 7 science chapter 16 Water A Precious Resource

Chapter 17     Solutions of NCERT class 7 science chapter 17 Forests Our Lifeline

Chapter 18

CBSE NCERT solutions for class 7 science chapter 18 Wastewater Story

NCERT Solutions for Class 7 Subject Wise

NCERT solutions for class 7 maths

CBSE NCERT solutions for class 7 science

Importance of  NCERT solutions for class 7 science chapter 15 light:

  • A tool like The CBSE NCERT solutions for class 7 science chapter 15 light helps students to solve homework problems
  • With the help of solutions of NCERT class 7 science chapter 15 light students can perform well in class 7 exams
  • CBSE NCERT solutions for class 7 science chapter 15 light covers questions related to all the concepts studied in the chapter.
  • The concepts studied in this chapter are revised in the coming classes also.
 

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