# 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:

(a)  virtual image. Only real images can be obtained on the screen.

(b) mirror.

(c)  plane.

(d) real image. On these type of images can be obtained on the screen.

(e) concave lens. As virtual images cannot be obtained on the screen.

(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.

 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.

(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.

An image formed by a plane mirror is:-

(i) virtual

(ii) erect

(iii) of the same size

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.

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.

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.

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.

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.

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

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

 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.

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$\times$2  =  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

## 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.