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Describe an activity to show that the incident ray, the reflected ray ...

Describe an activity to show that the in | Class 8 Science Chapter Light, Light NCERT Solutions

Welcome to the NCERT Solutions for Class 8 Science - Chapter Light. This page offers a step-by-step solution to the specific question from Exercise 1, Question 5: . With detailed answers and explanations for each chapter, students can strengthen their understanding and prepare confidently for exams. Ideal for CBSE and other board students, this resource will simplify your study experience.

Question 5:

Describe an activity to show that the incident ray, the reflected ray and the normal at the point of incidence lie in the same plane.

Answer:

The laws of reflection of light can be verified by the following activity:

experiment

Pin a white sheet of plane (mirror) paper on a cardboard.
Place a strip of plane mirror M^’on the plane paper.
Pined a 2 pins P₁ and P₂. Obliquely in front of the plane mirror in a straight line so that the line joining the pins can make an angle of 30◦, 45◦ and 60◦ with the normal drawn at the point of incidence.
See through the mirror from other side and observe the pins P₁ and P₂ seen on the mirror and pins P₃ and P₄ appears in the straight line.
Remove the plane mirror and the pins. Encircle the points where pins were fixed on the paper.
Join the P₁ and P₂ extended the line to meet at point O of the mirror. The ray AO so obtained is an incident ray.
Similarly join P₃ and P₄ and extend the line to meet at point O of the mirror. The ray O so obtained is a reflected ray.
Draw a normal OC.
Measure the angle of incidence ∠I and the angle of reflection ∠r. We find that ∠i = ∠r

Conclusion: This activity shows that the mirror incident ray, the reflection ray and the normal at the point of incidence, all lie on the same plane. The angle of the incidence is also equal to the angle of reflection. Thus, this activity verifies the laws of reflection.

Other Questions of Chapter Light

State the laws of reflection.

Two mirrors meet at right angles. A ray of light is incident on one at an angle of 30° as shown in Fig. 16.19. Draw the reflected ray from the second mirror.

Suppose you are in a dark room. Can you see objects in the room? Can you see objects outside the room. Explain.

What is the angle of incidence of a ray if the reflected ray is at an angle of 90° to the incident ray?

Draw a labeled sketch of the human eye.

How many images of a candle will be formed if it is placed between two parallel plane mirrors separated by 40 cm?

Image formed by a plane mirror is
(a) virtual, behind the mirror and enlarged
(b) virtual, behind the mirror and of the same size as the object
(c) real at the surface of the mirror and enlarged
(d) real, behind the mirror and of the same size as the object.

(a) Find out the position of the image of an object situated at A in the plane mirror (Fig. 16.21).
(b) Can Paheli at B see this image?
(c) Can Boojho at C see this image?
(d) When Paheli moves from B to C, where does the image of A move?

Boojho stands at A just on the side of a plane mirror as shown in Fig. 16.20. Can he see himself in the mirror? Also can he see the image of objects situated at P, Q and R?

Describe the construction of a kaleidoscope.

Popular questions of class 8 Science

Describe with the help of a diagram an instrument which can be used to detect a charged body.

Sketch larynx and explain its function in your own words.

Arrange the following boxes in proper order to make a flow chart of sugarcane crop production.

Make a labelled diagram of a candle flame.

What is metamorphosis? Give examples.

The following Table shows the total power shortage in India from 1991– 1997. Show the data in the form of a graph. Plot shortage percentage for the years on the Y-axis and the year on the X-axis.

Make sketches of animal and plant cells. State three differences between them.

What is a constellation? Name any two constellations.

Complete the crossword with the help of clues given below:
Across
1. This is necessary for photosynthesis.
3. Term for component present in the cytoplasm.
6. The living substance in the cell.
8. Units of inheritance present on the chromosomes.

Down
1. Green plastids.
2. Formed by collection of tissues.
4. It separates the contents of the cell from the surrounding medium.
5. Empty structure in the cytoplasm.
7. A group of cells.

Make a sketch of the human nerve cell. What function do nerve cells perform?

Recently Viewed Questions of Class 8 Science

How are babies produced through IVF technique? What are such babies called?

What is menstruation? Explain.

Do all the stars in the sky move? Explain.

Should the handle and bristles of a tooth brush be made of the same material? Explain your answer.

Suggest three measures to protect ourselves from lightning.

Explain how the use of CNG in automobiles has reduced pollution in our cities.

Fill in the blanks:

(a) Microorganisms can be seen with the help of a ____________.
(b) Blue green algae fix __________ directly from air to enhance fertility of soil.
(c) Alcohol is produced with the help of __________.
(d) Cholera is caused by __________.

Explain why a charged balloon is repelled by another charged balloon whereas an uncharged balloon is attracted by another charged balloon?

‘Avoid plastics as far as possible’. Comment on this advice.

Select the correct word from the following list and fill in the blanks.
float, water, crop, nutrients, preparation

(a) The same kind of plants grown and cultivated on a large scale at a place is called _____________.
(b) The first step before growing crops is _____________ of the soil.
(c) Damaged seeds would _____________ on top of water.
(d) For growing a crop, sufficient sunlight and _____________ and _____________ from the soil are essential.

Study Tips for Answering NCERT Questions:

NCERT questions are designed to test your understanding of the concepts and theories discussed in the chapter. Here are some tips to help you answer NCERT questions effectively:

Read the question carefully and focus on the core concept being asked.
Reference examples and data from the chapter when answering questions about Light.
Review previous year question papers to get an idea of how such questions may be framed in exams.
Practice answering questions within the time limit to improve your speed and accuracy.
Discuss your answers with your teachers or peers to get feedback and improve your understanding.

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