Light — Class 8 MCQs with Answers
Class 8 CBSE Science · Chapter 113
Pre-2026 syllabusThis chapter is from the older NCERT book. See the 2026-27 Class 8 Science chapters →
72 practice questions · 24 Easy · 24 Medium · 24 Hard · Updated
Practise the most important Class 8 CBSE Science questions from Chapter 113, "Light". You get 6 timed quizzes made from 72 NCERT-based MCQs, with answers and explanations. The questions are split into 24 Easy, 24 Medium and 24 Hard. Warm up on the basics, then move on to the exam-level questions that set top scorers in CBSE Board exams apart.
To score well in "Light", focus on clear concepts in physics, chemistry and biology basics. Each MCQ here is timed and uses exam-style marking (+4 correct, −1 wrong, 0 skipped). This trains you to stay accurate under time pressure, as real papers need. Every question has a short explanation, so a wrong answer becomes a quick lesson. It is the fastest way to fix gaps before a test.
Use this chapter for focused revision. Start with the Easy set to check your basics on Light, then move to Medium and Hard to practise applying them. Your accuracy, streaks and XP save automatically. This chapter also adds to your overall Class 8 Science mastery score. 14 sample questions are solved in full below, with the answer and a worked explanation. Sign in free to start practising.
Key concepts: Light (Class 8 Science)
This chapter covers reflection of light, image formation in mirrors, the human eye, and care of the eyes.
- Laws of reflection
- The angle of incidence equals the angle of reflection, and the incident ray, normal and reflected ray lie in one plane.
- Regular vs diffused reflection
- Smooth surfaces give regular reflection (clear image); rough surfaces give diffused reflection (no clear image).
- Images in a plane mirror
- Virtual, erect, same size, laterally inverted, and as far behind the mirror as the object is in front.
- The human eye
- Light enters through the cornea and pupil; the lens forms an image on the retina, sent to the brain by the optic nerve.
Light — important questions & MCQs with answers (Class 8 Science)
14 solved questions from this chapter's difficulty levels, each with its answer and explanation. The other 58 are timed and scored when you sign in.
- Q1Easy
Light travels in:
A.Curved pathsB.Zig-zag paths onlyC.Straight lines✓ CorrectD.CirclesAnswer: C. Straight lines
Explanation: Light travels in straight lines.
- Q2Easy
The image formed by a plane mirror is:
A.Real and invertedB.Virtual and erect✓ CorrectC.Real and erectD.Virtual and invertedAnswer: B. Virtual and erect
Explanation: A plane mirror forms a virtual, erect image of the same size as the object.
- Q3Easy
The splitting of white light into its seven colours is called:
A.ReflectionB.AbsorptionC.Lateral inversionD.Dispersion✓ CorrectAnswer: D. Dispersion
Explanation: Dispersion is the splitting of white light into its component colours.
- Q4Easy
The part of the eye on which the image is formed is the:
A.CorneaB.IrisC.Retina✓ CorrectD.PupilAnswer: C. Retina
Explanation: The image is formed on the retina at the back of the eye.
- Q5Easy
A device that uses two plane mirrors to see over obstacles, used in submarines, is a:
A.MicroscopeB.KaleidoscopeC.TelescopeD.Periscope✓ CorrectAnswer: D. Periscope
Explanation: A periscope uses two mirrors at 45° and is used in submarines to see above the water.
- Q6Easy
The system of raised dots that lets visually impaired people read by touch is called:
A.Morse codeB.Braille✓ CorrectC.Sign languageD.ShorthandAnswer: B. Braille
Explanation: Braille uses patterns of raised dots that are read by touch.
- Q7Medium
A ray of light strikes a mirror making an angle of incidence of 40°. The angle of reflection is:
A.50°B.80°C.40°✓ CorrectD.20°Answer: C. 40°
Explanation: By the law of reflection, the angle of reflection equals the angle of incidence, 40°.
- Q8Medium
The word AMBULANCE is written reversed on the front of the vehicle so that:
A.It reads correctly in the rear-view mirror of vehicles ahead✓ CorrectB.Drivers cannot read itC.It saves paintD.It looks stylishAnswer: A. It reads correctly in the rear-view mirror of vehicles ahead
Explanation: Lateral inversion in the mirror makes the reversed word appear correct to drivers looking in their mirrors.
- Q9Medium
When white light passes through a glass prism, it forms a band of colours because the prism:
A.Absorbs the lightB.Adds new coloursC.Splits (disperses) white light into its component colours✓ CorrectD.Reflects all the lightAnswer: C. Splits (disperses) white light into its component colours
Explanation: A prism disperses white light into the seven colours that make it up.
- Q10Medium
In bright light the pupil becomes small, while in dim light it becomes large. This is controlled by the:
A.CorneaB.RetinaC.Optic nerveD.Iris✓ CorrectAnswer: D. Iris
Explanation: The iris adjusts the pupil's size to control how much light enters the eye.
- Q11Medium
A periscope works by using two plane mirrors placed at:
A.45° to the path of light✓ CorrectB.90° to each otherC.0°D.180°Answer: A. 45° to the path of light
Explanation: Two mirrors at 45° reflect light down the tube so the viewer can see over obstacles.
- Q12Hard
A ray hits a plane mirror so that the angle between the incident ray and the mirror surface is 30°. The angle of reflection (measured from the normal) is:
A.30°B.60°✓ CorrectC.90°D.15°Answer: B. 60°
Explanation: The angle from the normal is 90° − 30° = 60°, and the angle of reflection equals it, 60°.
- Q13Hard
A girl stands 1 m in front of a plane mirror and walks 0.5 m towards it. The distance between her and her image is now:
A.1 m✓ CorrectB.2 mC.0.5 mD.1.5 mAnswer: A. 1 m
Explanation: She is now 0.5 m from the mirror, the image 0.5 m behind it, so they are 0.5 + 0.5 = 1 m apart.
- Q14Hard
A rainbow forms after rain when sunlight passes through water droplets. The droplets act like tiny prisms by:
A.Absorbing all coloursB.Dispersing white sunlight into its seven colours✓ CorrectC.Adding new colours to sunlightD.Removing colours from sunlightAnswer: B. Dispersing white sunlight into its seven colours
Explanation: Each droplet disperses sunlight into its component colours, together forming the rainbow.
Start this chapter free
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This chapter has 72 questions (24 Easy · 24 Medium · 24 Hard), with timed scoring and instant feedback. The rest unlock with the ₹999/year plan.
Start this chapter free →Light — FAQs
What are the key concepts in Class 8 Science Light?+
This chapter covers reflection of light, image formation in mirrors, the human eye, and care of the eyes. Key ideas include Laws of reflection, Regular vs diffused reflection, Images in a plane mirror, The human eye.
What does Class 8 Science Chapter 113 (Light) cover on XamBaaz?+
It has 72 NCERT-based MCQs on "Light": 24 Easy, 24 Medium and 24 Hard. Together they make 6 timed quizzes, and you never get the same set twice. Every question has an instant explanation. They help you prepare for CBSE Board exams.
Are these "Light" questions free to practise?+
Yes. Sign in with Google to practise "Light" free. Full unlimited access is ₹999/year on a launch offer until 1 December 2026. No chapter is charged separately.
How should I revise "Light" for the exam?+
Start with the Easy quiz to check your basics, then try Medium and Hard to practise applying them. There are 6 timed quizzes on this chapter, so you can come back for a fresh set instead of one you have seen. Read each explanation, retry the questions you miss, and track your accuracy until it stays high.
Are these "Light" MCQs available with answers?+
Yes. 14 sample questions are shown here in full, each with the correct option and a step-by-step "Why" explanation. Sign in free with Google to start practising, with instant scoring.
Is there negative marking in the "Light" quizzes?+
Yes. The timed quizzes use exam-style marking: +4 for a right answer, −1 for a wrong one and 0 for a skip. MHT-CET and CBSE board papers have no negative marking. Our mocks for those are scored their way.
What are the important questions from Light (Class 8 Science)?+
The questions that matter most test Laws of reflection, Regular vs diffused reflection, Images in a plane mirror, The human eye. This page shows 14 solved important MCQs with answers and explanations; all 72 questions on the chapter are available as timed quizzes once you sign in.
Is there an online quiz for Light?+
Yes — Class 8 Science Light has timed online quizzes at Easy, Medium and Hard levels, with instant scoring and a worked explanation on every question. The first quiz on the chapter is free.