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![Selina solutions for Concise Physics [English] Class 7 ICSE chapter 4 - Light Energy - Shaalaa.com](/images/concise-physics-english-class-7-icse_6:e046542b930449d498b216fad2b02edd.jpg "Selina solutions for Concise Physics [English] Class 7 ICSE chapter 4 - Light Energy")
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Solutions for Chapter 4: Light Energy
Below listed, you can find solutions for Chapter 4 of CISCE Selina for Concise Physics [English] Class 7 ICSE.
Selina solutions for Concise Physics [English] Class 7 ICSE 4 Light Energy Objective Questions
Write true or false of the following statement.
The image formed by a plane mirror is real
True
False
Write true or false of the following statement.
When a light ray is reflected from a wall, the angle of incidence is not equal to the angle of reflection.
True
False
Write true or false of the following statement.
The image of the right hand in a plane mirror looks like that of a left hand.
True
False
Write true or false of the following statement.
The image formed by a plane mirror is upright.
True
False
Write true or false of the following statement.
The image formed by a plane mirror can be obtained on a screen.
True
False
Write true or false of the following statement.
The objects are seen around us due to irregular reflection of light.
True
False
Write true or false of the following statement.
The speed of light in vacuum is 3 × 108 ms-1.
True
False
Write true or false of the following statement.
A rose appears red in light of all the colours.
True
False
Write true or false of the following statement.
A black paper absorbs light of all the colours and reflects none.
True
False
Write true or false of the following statement.
The primary colours are red, blue and green.
True
False
Fill in the blank
Angle of incidence = ___________
Fill in the blank
The incident ray, the reflected ray and the normal lie in one _______
Fill in the blank
The image formed by a plane mirror is at a distance behind the mirror as ________
Fill in the blank
The image formed by a plane mirror is erect and _____
Fill in the blank
We are able to see the objects around us due to _________, reflection.
Fill in the blank
A ________ image cannot be obtained on a screen.
Fill in the blank
A plane mirror _________ reflects 100 percent light falling on it.
Fill in the blank
The colour of an opaque object is the colour of light which it _______
Fill in the blank
Magenta, cyan and yellow are the ________ colours.
Match the following
| (a). A light ray passes from air to glass | (1) . speeds up |
| (b). A light ray passes from glass to water | (2). reflects red light |
| (c). Virtual image | (3). primary colours |
| (d). Red rose | (4). plane mirror |
| (e). Red, green, and blue | (5). slows down |
Select the correct alternative
A man standing in front of a plane mirror finds his image to be at a distance of 6 meter from himself. The distance of man from the mirror is
6 m
3 m
2 m
12 m
Select the correct alternative
The angle between the incident ray and the ray reflected from the plane mirror is 70°. The angle of incidence will be :
70°
30°
35°
90°
Select the correct alternative
The image formed by a plane mirror is
virtual and inverted
virtual and of same size
real and inverted
real and of same size
Select the correct alternative
The angle of incidence on a plane mirror is 30°.The angle of reflection will be:
30°
60°
15°
0°
Select the correct alternative
The angle of incidence on a plane mirror is 30°. The angle between the incident ray and the reflected ray is
30°
15°
60°
90°
Select the correct alternative
The property due to which a light ray striking a surface is returned back into the same medium is called
refraction
reflex action
reflection
regression
Select the correct alternative
The speed of light is maximum in
glass
water
air
wood
Select the correct alternative
A red rose is seen in green light. It will appear.
red
blue
yellow
black
Select the correct alternative
The primary colours are
Red, Blue and Yellow
Magenta, Yellow and Cyan
Red, Blue and Cyan
Blue, Green and Red
Selina solutions for Concise Physics [English] Class 7 ICSE 4 Light Energy Short/Long Answer Questions
What do you mean by the term reflection of light ?
How is a plane mirror made ?
Explain the following terms:
Incident ray, Reflected ray, Angle of incidence, Angle of reflection, Normal.
Draw a diagram showing the reflection of a light ray from a plane mirror. Label on it the incident ray, the reflected ray, the normal, the angle of incidence i and the angle of reflection r.
State the two laws of reflection of light.
Describe an experiment to verify the laws of reflection of light. Ans. Laws of reflection.
A ray of light falls normally on a plane mirror. What is the angle of incidence ?
Draw a diagram to show the reflection of a light ray incident normally on a plane mirror.
The diagram in Fig. shows an incident ray AO and the reflected ray OB from a plane mirror. The angle AOB is 30°. Draw normal on the plane mirror at the point O and find:
In the following diagrams, measure and write the angle of incidence and draw the reflected ray in a given case.
In the following diagrams, measure and write the angle of incidence and draw the reflected ray in each case.
In the following diagram, measure and write the angle of incidence and draw the reflected ray.
The diagram in fig. shows an incident ray AO and the normal ON on a plane mirror. Draw the reflected ray. State the law you use to draw the direction of the reflected ray.
The following diagram shows an incident ray AO and the normal ON on a plane mirror. Find the angle of incidence and angle of reflection.
State in words, how do you find the location of image of an object formed by a plane mirror.
Draw a ray diagram showing the formation of image of a point object by a plane mirror.
The following diagram shows a point object O placed in front of a plane mirror. Take two rays from the point O and show how the image of O is formed and seen by the eye.
State four characteristics of the image formed by a plane mirror.
How is the position of image formed by a plane mirror related to the position of the object ?
You are standing at a distance of 2 meters from a plane mirror.
What is the distance of your image from the mirror?
You are standing at a distance of 2 meters from a plane mirror.
What is the distance between you and your image?
What is meant by lateral inversion of an image in a plane mirror ? Explain it with the help of a diagram.
Wirte down the letter C and I as seen in a plane mirror.
What is irregular reflection ? Give an example.
How do we see objects around us ?
State two uses of a plane mirror.
Can light travel in vacuum ?
State the speed of light in (a) air, (b) glass.
State whether light slows down or speeds up in the following cases :
Light going from air to glass.
State whether light slows down or speeds up in the following cases :
Light going from glass to water.
State whether light slows down or speeds up in the following cases :
Light going from water to air.
What are the primary colours ? Name the three primary colours.
What are the secondary colours ? Name the three secondary colours.
Fill in the blank with the appropriate colour
Blue + _______ = Cyan
Fill in the blank with the appropriate color
Red + Blue + _______ = White
Fill in the blank with the appropriate colour
Red + Blue = _______
Fill in the blank with the appropriate colour
Green + Red = ______
The leaves appear green when seen in white light. Give a reason.
A rose appears red in white light. How will it appear in
green light? Give a reason for your answer.
A rose appears red in white light. How will it appear in red light?
Give a reason for your answer.
Why does a piece of paper appear white in sunlight ? How would you expect it to appear when viewed in red light?
A piece of paper appears black in sunlight. What will be its colour when seen in red light?
Solutions for 4: Light Energy
Selina solutions for Concise Physics [English] Class 7 ICSE chapter 4 - Light Energy
Shaalaa.com has the CISCE Mathematics Concise Physics [English] Class 7 ICSE CISCE solutions in a manner that help students grasp basic concepts better and faster. The detailed, step-by-step solutions will help you understand the concepts better and clarify any confusion. Selina solutions for Mathematics Concise Physics [English] Class 7 ICSE CISCE 4 (Light Energy) include all questions with answers and detailed explanations. This will clear students' doubts about questions and improve their application skills while preparing for board exams.
Further, we at Shaalaa.com provide such solutions so students can prepare for written exams. Selina textbook solutions can be a core help for self-study and provide excellent self-help guidance for students.
Concepts covered in Concise Physics [English] Class 7 ICSE chapter 4 Light Energy are Reflection of Light, Terms Used in Reflection of Light, Law of Reflection of Light, Images Formed by a Plane Mirrors, Speed of Light, Colour, Light, Plane Mirror, Verification of the Law of Reflection of Light, Reflection of a Ray of Light Normally Incident on a Plane Mirror, Formation of Image by Reflection: Real and Virtual Image, Lateral Inversion, Types of Reflection.
Using Selina Concise Physics [English] Class 7 ICSE solutions Light Energy exercise by students is an easy way to prepare for the exams, as they involve solutions arranged chapter-wise and also page-wise. The questions involved in Selina Solutions are essential questions that can be asked in the final exam. Maximum CISCE Concise Physics [English] Class 7 ICSE students prefer Selina Textbook Solutions to score more in exams.
Get the free view of Chapter 4, Light Energy Concise Physics [English] Class 7 ICSE additional questions for Mathematics Concise Physics [English] Class 7 ICSE CISCE, and you can use Shaalaa.com to keep it handy for your exam preparation.
