Explain NCERT Class 10 Science Activity 10.3 Solution | Activity 10.3 Class 10 Science Chapter 10

 Explain NCERT Class 10 Science Activity 10.3 Solution 

In this article, we will discuss activity 10.3 class 10 science. You will find a complete explanation with a conclusion.

After studying this activity 10.3 Class 10 Science Light- Reflection and Refraction, you will be able to solve Questions of Chapter 10 Light- Reflection and Refraction.

 

Activity 10.3 Class 10 Science

    ·     Take a concave mirror. Find out its approximate focal length in the way described above. Note down the value of focal length. (You can also find it out by obtaining an image of a distant object on a sheet of paper)

   ·     Mark a line on a table with chalk. Place the concave mirror on a stand. Place the stand over the time such that its pole lies over the line.

   ·     Draw with chalk two more lines parallel to the previous line such that the distance between any two successive lines is equal to the focal length of the mirror. These lines will now correspond to the positions of points P, F, and C, respectively. Remember – For the spherical mirror of a small aperture, the principal focus F lies midway between pole P and the Centre of curvature C.

   ·     Keep a bright object, say a burning candle, at a position beyond C. place a paper screen and move it inforout of the mirror till you obtain a sharp bright image of the candle flame on it.

    ·     Observe the image carefully. Note down its nature, position, and relative size with respect to the object size.

    ·     Repeat the activity by placing the candle just(a) beyond C,(b) at C (c)  between F and C and (d) at F, and (e) between P and F.

    ·     In one of the cases, you may not get the image on the screen. Identify the position of the object in such a case. Then look for its virtual image in the mirror itself.

    ·     Note down and tabulate your observation.

Finding the focal length of a concave mirror

We can find the focal length of the concave through activity 10.2. when the concave mirror is placed facing the sun, a sharp bright spot of light is obtained on the paper. This is the real image of the sun and this position is a focus point of the mirror. We can get focal length by measuring the distance of the image from the mirror.

 

Observation and explanation of activity 10.3 class 10 science

Now we place the concave mirror on a stand directing its reflecting side towards a pillar. Hold a cardboard screen on another stand in front of the mirror.

Now move the screen back and forth until a sharp image is formed.

Now we will mark a line on the table with chalk and place the concave mirror on this line which represents the pole(P) of the concave mirror.

Now draw two more lines parallel to the previous line. The line close to the pole represents the principal focus and the other line represents the Centre of curvature (C).

(a)        Beyond C - When we keep a bright object (a burning candle) beyond C and move the paper screen back and forth to get a sharp image of the candle flame on the screen.

Nature of image - Real and inverted

Position of the image – Between F and C

Size of image – smaller than the object

Now we repeat this activity by placing objects in different positions as follows-

(b)       At C – now the object is placed at C before the concave mirror

Nature of image - Real and inverted

Position of the image – At  C

Size of image – same size as the object

(c)        Between C and F - now the object is placed between F and C

Nature of image - Real and inverted

Position of image – beyond C

Size of image – bigger than the object

(d)       At F - The object is placed at focus point (F)

Nature of image - Real and inverted

Position of image – At infinity

Size of image – Bigger than the object

(e)        Between F and P – Now the object is placed between F and P

Nature of image – Virtual and erect

Position of image – image is formed behind the mirror

Size of image – bigger than the object

Conclusion of activity 10.3 class 10 science

We can determine the position, nature, and size of the image formed by the concave mirror when the object is placed at different positions in front of the mirror by this activity 10.3 class 10 science.

Watch the video to understand the topic 

 Related Topics for You

1. Next activity- Activity 10.4 Class 10 Science

2. Previous activity- Activity 10.2 Class 10 Science

3. NCERT Solutions of Chapter 10 

Frequently Asked Questions

1.  Real image is formed by which mirror?

 Ans. - Real image is formed by the concave mirror.

2. What are the characteristics of images formed by concave mirror?

Ans- (i) Most of the images formed by the concave mirror are real and inverted but a virtual image is also formed when an object is placed between F and P.