Light Energy
Each subtopic includes About section, revision page link, 10 preview questions, and practice CTAs.
Reflection of Light
SubtopicReflection of Light under Light Energy for Grade 7 ICSE.
Preview questions (no answers)
- 1.
When light rays from a point meet at another point after reflection, the image formed is:
A.Virtual
B.Erect
C.Real
D.Laterally inverted
- 2.
Which of these surfaces will scatter light in many different directions?
A.A plane mirror
B.A polished steel plate
C.A piece of chalk
D.A glass sheet
- 3.
The angle of incidence is denoted by the letter:
A.B.C.D. - 4.
If you move 1 meter away from a plane mirror, how far does your image move from you?
A.1 meter
B.0.5 meters
C.2 meters
D.It does not move
- 5.
In the diagram provided, is the incident ray, is the reflected ray, is the normal, and is the plane mirror. If the total angle between the incident ray and the reflected ray () is , what is the value of the angle between the reflected ray and the mirror surface ()?
A.B.C.D. - 6.
The incident ray, the reflected ray and the normal all lie in the same:
A.Line
B.Plane
C.Point
D.Angle
- 7.
If the angle between two mirrors is , how many images will be formed?
A.9
B.8
C.7
D.10
- 8.
An object is placed at the focus of a convex mirror. Where is the image formed?
A.At infinity
B.At the pole
C.Between focus and pole
D.At the center of curvature
- 9.
If the glancing angle (angle with the surface) of incidence for a ray of light is , then the angle between the incident and reflected ray is:
A.B.C.D. - 10.
How many images of himself will a man see if he stands between two plane mirrors inclined at ?
A.9
B.8
C.7
D.Infinite
Download the worksheet for Light Energy - Reflection of Light to practice offline. It includes additional chapter-level practice questions.
Laws of Reflection
SubtopicLaws of Reflection under Light Energy for Grade 7 ICSE.
Preview questions (no answers)
- 1.
Which of the following is true for a virtual image?
A.Light rays actually meet at the image point
B.It can be projected onto a wall
C.Light rays only appear to meet at the image point
D.It is always inverted
- 2.
If the angle between the incident ray and the mirror surface is , then the angle of incidence is:
A.B.C.D. - 3.
Which of these objects would show diffuse reflection?
A.Still water
B.A new steel plate
C.A piece of cardboard
D.A looking glass
- 4.
The angle of incidence is and the angle of reflection is . Which equation is correct?
A.B.C.D. - 5.
When a beam of light falls on a piece of cardboard, it reflects in many directions. This is called:
A.Regular reflection
B.Diffused reflection
C.Total internal reflection
D.Refraction
- 6.
What is the relationship between the glancing angle and the angle of incidence ?
A.B.C.D. - 7.
Which of the following demonstrates the application of multiple reflection?
A.Shadow formation
B.Periscope
C.Barber's shop mirrors
D.Solar cooker
- 8.
The angle of incidence is . If the angle between the reflected ray and the mirror is , and , what is the value of ?
A.B.C.D. - 9.
Which of the following describes the nature of the image formed by a plane mirror?
A.Real, inverted, same size
B.Virtual, erect, same size
C.Virtual, inverted, diminished
D.Real, erect, magnified
- 10.
If an incident ray makes an angle of with the surface of the mirror, what is the angle of deviation?
A.B.C.D.
Download the worksheet for Light Energy - Laws of Reflection to practice offline. It includes additional chapter-level practice questions.
Formation of Image in a Plane Mirror
SubtopicFormation of Image in a Plane Mirror under Light Energy for Grade 7 ICSE.
Preview questions (no answers)
- 1.
The angle of reflection is the angle between:
A.The incident ray and the mirror
B.The reflected ray and the mirror
C.The normal and the reflected ray
D.The incident ray and the reflected ray
- 2.
If a ray of light falls on a plane mirror such that the angle of incidence is , the reflected ray will:
A.Pass through the mirror
B.Be at 90° to the incident ray
C.Retrace its path
D.Be at 180° to the normal
- 3.
An image that can be seen but cannot be caught on a screen is called:
A.A real image
B.A virtual image
C.A shadow
D.A reflection
- 4.
A periscope allows a person to see objects that are:
A.Invisibly small
B.Very far away in outer space
C.Hidden by an obstacle or at a different level
D.Inside a solid opaque box
- 5.
If a light ray strikes a plane mirror at an angle of to the mirror surface, the angle of reflection is:
A.B.C.D. - 6.
The property that a plane mirror forms an image of the same size as the object means the magnification is:
A.Greater than 1
B.Less than 1
C.Zero
D.Equal to 1
- 7.
How many images are formed by two mirrors at to each other?
A.5
B.4
C.6
D.3
- 8.
A ray of light is incident on a plane mirror at an angle . If the mirror is rotated through an angle about an axis in its plane, the reflected ray is turned through an angle . This assumes:
A.The incident ray direction remains constant
B.The mirror is perfectly reflecting
C.The angle i is zero
D. - 9.
An object is placed from a plane mirror. If the object is moved away and the mirror is moved towards the object's original position, what is the distance of the new image from the object's original position?
A.20 cm
B.15 cm
C.25 cm
D.10 cm
- 10.
Two plane mirrors are inclined at an angle such that they form 5 images of an object placed symmetrically. If the angle is increased by , how many images will be formed now?
A.3
B.2
C.4
D.1
Download the worksheet for Light Energy - Formation of Image in a Plane Mirror to practice offline. It includes additional chapter-level practice questions.
Lateral Inversion
SubtopicLateral Inversion under Light Energy for Grade 7 ICSE.
Preview questions (no answers)
- 1.
Which letter among these will NOT appear to change its shape in a mirror?
A.S
B.Z
C.U
D.G
- 2.
A digital clock shows 12:11. What will be the middle digit in the mirror image?
A.1
B.2
C.5
D.The colon (:)
- 3.
If you point your finger to the right in front of a mirror, the image points to the:
A.Left
B.Right
C.Up
D.Down
- 4.
Which of these letters will show lateral inversion?
A.I
B.O
C.N
D.M
- 5.
Which of the following is the best definition of lateral inversion?
A.The image is formed upside down
B.The right side of the object appears as the left side of the image and vice versa
C.The image is smaller than the object
D.The image is formed on a screen
- 6.
If a person parts their hair on the right side, on which side will the parting appear in their reflection?
A.Right side
B.Left side
C.Middle
D.It will not be visible
- 7.
How many letters in the word 'QUALITY' will appear laterally inverted in a plane mirror?
A.4
B.5
C.6
D.7
- 8.
A person is standing before a plane mirror at a distance of m. If they move m toward the mirror, the distance between the person and the image of their back (which is m behind them) will be:
A.m
B.m
C.m
D.m
- 9.
Which letter of the English alphabet, when rotated in its own plane, looks exactly like its laterally inverted image?
A.S
B.H
C.N
D.M
- 10.
A clock is viewed through a mirror and it shows . What is the actual time?
A.B.C.D.
Download the worksheet for Light Energy - Lateral Inversion to practice offline. It includes additional chapter-level practice questions.
Preview questions (no answers)
- 1.
Which of these devices uses reflection from plane mirrors to see over a wall?
A.Microscope
B.Telescope
C.Periscope
D.Stethoscope
- 2.
A virtual image is one that:
A.Can be caught on a screen
B.Cannot be caught on a screen
C.Is always upside down
D.Is always larger than the object
- 3.
Mirrors are usually made by coating one side of a glass sheet with a thin layer of:
A.Silver or Aluminum
B.Plastic
C.Paper
D.Copper
- 4.
If you touch a mirror and it feels flat, it is most likely a:
A.Concave mirror
B.Plane mirror
C.Convex mirror
D.Cylindrical mirror
- 5.
Which mirror is used in the 'viewfinder' of some older cameras to reflect light towards the eye?
A.Convex mirror
B.Concave mirror
C.Plane mirror
D.Spherical mirror
- 6.
What kind of image is formed by a plane mirror?
A.Real and upright
B.Virtual and inverted
C.Real and inverted
D.Virtual and laterally inverted
- 7.
If you are standing in a room with mirrors on all four walls, you see many images of yourself. This is an application of:
A.Refraction
B.Single reflection
C.Multiple reflections
D.Lateral inversion
- 8.
A student stands between two plane mirrors inclined at . How many images of himself can he see?
A.2
B.3
C.4
D.5
- 9.
Which statement is true regarding the images formed by a convex mirror used as a side-view mirror in a car?
A.The images are always real and thus can be seen clearly
B.The magnification is always less than 1
C.The image distance is always greater than the object distance
D.The focal length depends on the distance of the car behind
- 10.
In a solar power plant using a heliostat field, what type of mirror is primarily used to track the sun and reflect light toward a central receiver tower?
A.Concave mirrors
B.Convex mirrors
C.Plane mirrors
D.Parabolic mirrors
Download the worksheet for Light Energy - Uses of Mirrors to practice offline. It includes additional chapter-level practice questions.