50+ MCQs on Light – Class 8 Science Chapter 16 (with Answers)

Here is a complete list of important Multiple-Choice Questions (MCQs) on Light for Class 8 Science. These questions are fully aligned with the CBSE Class 8 Science syllabus and are essential for CBSE exam preparation, school tests, and competitive Olympiads.

The topic “Light” covers core physics concepts such as reflection, image formation, the human eye, and vision care — all of which are high-weightage areas in the CBSE Syllabus.
This page helps students revise, test, and strengthen their understanding through structured, topic-wise MCQs designed exactly according to the NCERT framework.

MCQs Class 8 Science Light: Luminous and Non-Luminous Objects

Light is a form of energy that enables us to see things around us. We see an object when light from it (or reflected by it) enters our eyes.

Luminous Objects: Objects that emit their own light are called luminous objects. Examples: Sun, candle, bulb, torch, and fire.

Non-Luminous (Illuminated) Objects: Objects that do not produce their own light but become visible when light from luminous objects reflects from their surface.

Examples: Moon, chair, wall, and book.

These concepts are fundamental to NCERT Class 8 Science Chapter 16 – Light and are among the most important questions with answers for CBSE exams.

MCQs on Light Class 8 – Luminous & Non-Luminous Objects)

Q1. Which of the following is a luminous object?

A) Moon

B) Torch

C) Table

D) Mirror

Answer: B) Torch

Explanation: A torch emits its own light, while the others either reflect light or do not produce light at all.

Q2. Which of these is a non-luminous object?

A) Sun

B) Candle flame

C) Chair

D) Star

Answer: C) Chair

Explanation: A chair does not emit light; it becomes visible only when light falls on it.

Q3. We can see a book in daylight because —

A) The book emits its own light.

B) The Sun’s light is reflected by the book.

C) The book produces heat.

D) The book glows in sunlight.

Answer: B) The Sun’s light is reflected by the book.

Explanation: The book is a non-luminous object that reflects light from the Sun to our eyes.

Q4. The Moon is —

A) A luminous object

B) A non-luminous object

C) A source of light

D) A star

Answer: B) A non-luminous object

Explanation: The Moon shines due to reflected sunlight; it does not emit its own light.

Q5. Which of the following is a natural luminous object?

A) Electric bulb

B) Candle

C) Sun

D) Torch

Answer: C) Sun

Explanation: The Sun emits its own light naturally and is the main source of light on Earth.

Q6. Which of the following does not produce light on its own?

A) Firefly

B) Star

C) Moon

D) Lamp

Answer: C) Moon

Explanation: The Moon is illuminated by sunlight; it doesn’t generate its own light.

Q7. What type of object is a glow-worm?

A) Luminous

B) Non-luminous

C) Transparent

D) Translucent

Answer: A) Luminous

Explanation: Glow-worms produce light through a biological chemical reaction called bioluminescence.

Q8. Which of these is a man-made luminous object?

A) Torch

B) Star

C) Sun

D) Lightning

Answer: A) Torch

Explanation: The torch emits light when electricity flows through it, making it a man-made luminous source.

Q9. Why can we see a wall in a well-lit room?

A) Because it emits light.

B) Because it reflects light from a luminous source.

C) Because it is transparent.

D) Because it stores light.

Answer: B) Because it reflects light from a luminous source.

Explanation: The wall reflects light from the bulb or Sun, allowing us to see it.

Q10. Which of the following statements about luminous and non-luminous objects is true?

A) All objects that glow are luminous.

B) All luminous objects are man-made.

C) Non-luminous objects reflect light from luminous objects.

D) Luminous objects can never be natural.

Answer: C) Non-luminous objects reflect light from luminous objects.

Explanation: Luminous objects emit light; non-luminous objects reflect it to become visible.

MCQs on Reflection of Light and its Laws (Class 8 Science Chapter 16 – Light)

Reflection is the bouncing back of light when it strikes a smooth, shiny surface such as a mirror.

Incident Ray: The ray of light that strikes the surface is called the incident ray.

Reflected Ray: The ray of light that bounces back from the surface is called the reflected ray.

Normal: A line drawn perpendicular (90°) to the surface at the point where the incident ray strikes is called the normal.

Angle of Incidence (∠i): The angle between the incident ray and the normal.

Angle of Reflection (∠r): The angle between the reflected ray and the normal.

First Law: The angle of incidence (∠i) is always equal to the angle of reflection (∠r).

Second Law: The incident ray, reflected ray, and the normal all lie in the same plane.

These are the two fundamental laws of reflection studied in NCERT Class 8 Science Chapter 16 – Light, and they form the base for all MCQs on laws of reflection.

Practice Questions (MCQs on Reflection of Light and Its Laws)

Q1. The bouncing back of light when it hits a smooth surface is called —

A) Refraction

B) Reflection

C) Dispersion

D) Diffusion

Answer: B) Reflection

Explanation: Reflection occurs when light rays hit a surface and bounce back into the same medium.

Q2. The ray of light that strikes a surface is called the —

A) Reflected ray

B) Incident ray

C) Normal

D) Shadow ray

Answer: B) Incident ray

Explanation: The incident ray is the ray that approaches and hits the surface.

Q3. The ray of light that bounces back from a reflecting surface is called the —

A) Refracted ray

B) Normal

C) Reflected ray

D) Diffused ray

Answer: C) Reflected ray

Explanation: The reflected ray travels away from the surface after bouncing off it.

Q4. The line drawn at 90° to the surface at the point of incidence is known as the —

A) Normal

B) Mirror line

C) Axis

D) Reflected line

Answer: A) Normal

Explanation: The normal is a perpendicular line used to measure angles of incidence and reflection.

Q5. The angle between the incident ray and the normal is called —

A) Angle of reflection

B) Angle of incidence

C) Angle of refraction

D) Right angle

Answer: B) Angle of incidence

Explanation: The angle of incidence (∠i) is measured between the incident ray and the normal.

Q6. The angle between the reflected ray and the normal is known as —

A) Angle of reflection

B) Angle of incidence

C) Mirror angle

D) Plane angle

Answer: A) Angle of reflection

Explanation: The angle of reflection (∠r) is formed between the normal and the reflected ray.

Q7. According to the first law of reflection,

A) ∠i = ∠r

B) ∠i > ∠r

C) ∠i < ∠r

D) ∠i + ∠r = 90°

Answer: A) ∠i = ∠r

Explanation: The first law of reflection states that the angle of incidence equals the angle of reflection.

Q8. The incident ray, reflected ray, and the normal —

A) Lie on different planes

B) Lie in the same plane

C) Are parallel to each other

D) Do not intersect

Answer: B) Lie in the same plane

Explanation: The second law of reflection states that all three lie in the same plane.

Q9. If the angle between the incident ray and reflected ray is 60°, what is the angle of incidence?

A) 15°

B) 30°

C) 45°

D) 60°

Answer: B) 30°

Explanation: The angle between incident and reflected rays = ∠i + ∠r = 60° → Since ∠i = ∠r, each angle = 30°.

Q10. Reflection of light occurs due to —

A) Bending of light

B) Absorption of light

C) Bouncing back of light

D) Transmission of light

Answer: C) Bouncing back of light

Explanation: Reflection is the process by which light rays bounce back from a polished surface like a mirror.

MCQs on Regular vs. Diffused Reflection and Plane Mirrors (Class 8 Science – Light)

Regular Reflection: Occurs when light falls on a smooth, shiny surface such as a mirror or polished steel. The reflected rays remain parallel, forming a clear image.

Diffused (Or Irregular) Reflection: Takes place on rough or uneven surfaces like paper, wall, or cardboard. The light is scattered in many directions, so no clear image is formed. Even during diffused reflection, the laws of reflection are not violated—each individual ray still obeys ∠i = ∠r.

Plane Mirror Image Characteristics:

• The image is virtual (cannot be captured on a screen).
• It is erect (upright).
• It is of the same size as the object.
• It is laterally inverted (left–right reversed).

Lateral Inversion: The left-right reversal of an image in a mirror—for example, the word AMBULANCE appears reversed on vehicles so drivers see it correctly in their mirrors.

Practice Questions (MCQs on Reflection and Plane Mirror)

Q1. Reflection of light from a smooth surface like a mirror is called —

A) Diffused reflection

B) Regular reflection

C) Irregular reflection

D) Random reflection

Answer: B) Regular reflection

Explanation: A mirror has a smooth surface that reflects parallel rays in one direction, forming a clear image.

Q2. Reflection of light from a rough surface like cardboard is called —

A) Regular reflection

B) Diffused reflection

C) Random reflection

D) Specular reflection

Answer: B) Diffused reflection

Explanation: Rough surfaces scatter light in many directions, leading to diffused reflection without image formation.

Q3. Does diffused reflection violate the laws of reflection?

A) Yes

B) No

C) Partly

D) Only in darkness

Answer: B) No

Explanation: Each individual ray still obeys the laws of reflection; irregularity of surface causes scattered directions, not violation.

Q4. Which of the following statements about images formed by a plane mirror is true?

A) Image is real and inverted.

B) Image is virtual and erect.

C) Image is smaller than the object.

D) Image can be captured on a screen.

Answer: B) Image is virtual and erect.

Explanation: A plane mirror produces a virtual, erect, same-sized, laterally inverted image.

Q5. The word “AMBULANCE” is written backward on vehicles because —

A) It looks stylish.

B) To appear correctly in rear-view mirrors.

C) To attract attention at night.

D) It is a rule for emergency vehicles.

Answer: B) To appear correctly in rear-view mirrors.

Explanation: Due to lateral inversion, the reversed letters appear normal in a driver’s mirror view.

Q6. What kind of reflection occurs on a new steel plate?

A) Regular reflection

B) Diffused reflection

C) Irregular reflection

D) Multiple reflection

Answer: A) Regular reflection

Explanation: A polished steel plate has a smooth surface that reflects light regularly, producing a clear image.

Q7. The image formed in a plane mirror is always —

A) Real and inverted

B) Virtual, erect, and same size

C) Smaller than object

D) Magnified

Answer: B) Virtual, erect, and same size

Explanation: A plane mirror forms a virtual image that appears behind the mirror, upright and equal in size to the object.

MCQs on The Human Eye (Structure and Function)

Class 8 MCQs on Light: MCQs on The Human Eye)

Q1. Where is the image formed in the human eye?

A) On the cornea

B) On the retina

C) On the lens

D) On the optic nerve

Answer: B) On the retina

Explanation: The retina acts like the screen of a camera, where the lens focuses the image.

Q2. Which part of the eye controls the amount of light entering it?

A) The lens

B) The cornea

C) The iris

D) The retina

Answer: C) The iris

Explanation: The iris expands or contracts to change the size of the pupil, controlling how much light gets in.

Q3. The cells on the retina that are sensitive to color are called —

A) Rods

B) Cones

C) Optic nerves

D) Pupils

Answer: B) Cones

Explanation: Cones are for Color and bright light. Rods are for dim light.

Q4. The "blind spot" is called so because —

A) It is the darkest part of the eye

B) It has no light-sensitive cells (rods or cones)

C) It is where the lens is located

D) It is only active in the dark

Answer: B) It has no light-sensitive cells (rods or cones)

Explanation: This is the point where the optic nerve exits the eye, so there are no photoreceptors.

Class 8 MCQs on Light: Multiple Reflections and Dispersion

Q1. A kaleidoscope works on the principle of —

A) Dispersion

B) Refraction

C) Multiple reflections

D) Diffused reflection

Answer: C) Multiple reflections

Explanation: A kaleidoscope uses mirrors (usually three) placed at an angle to create beautiful patterns from multiple reflections.

Q2. The splitting of white light into seven colors is called —

A) Reflection

B) Dispersion

C) Lateral inversion

D) Refraction

Answer: B) Dispersion

Explanation: This is the definition of dispersion, which can be seen when light passes through a prism.

Q3. How many images are formed of an object placed between two parallel plane mirrors?

A) One

B) Two

C) Ten

D) Infinite

Answer: D) Infinite

Explanation: The image formed by one mirror acts as the object for the other mirror, and this process repeats infinitely.

CBSE Class 8 Light MCQs on Vision Care and The Braille System

Q1. The deficiency of which vitamin can cause night blindness?

A) Vitamin C

B) Vitamin D

C) Vitamin A

D) Vitamin B

Answer: C) Vitamin A

Explanation: Vitamin A is essential for healthy eyes and vision, especially for the function of rods (dim light vision).

Q2. What is the Braille system used for?

A) A system for hearing-impaired people

B) A system for visually-impaired people to read and write

C) A system for measuring the power of the lens

D) A system for treating cataracts

Answer: B) A system for visually-impaired people to read and write

Explanation: The Braille system uses raised dots to represent characters, which are read by touch.

Q3. The eye condition in which the lens becomes cloudy and vision is blurred is called —

A) Night blindness

B) Cataract

C) Blind spot

D) Myopia

Answer: B) Cataract

Explanation: Cataract is an age-related condition that is corrected by replacing the cloudy lens with an artificial one.