Light: Mirrors and Lenses — Class 8 MCQs with Answers
Class 8 CBSE Science · Chapter 10
72 practice questions · 24 Easy · 24 Medium · 24 Hard · Updated
Practise the most important Class 8 CBSE Science questions from Chapter 10, "Light: Mirrors and Lenses". You get 9 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 top scorers in CBSE Board exams get right.
To score well in "Light: Mirrors and Lenses", 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 helps you stay accurate when time is short, just 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: Mirrors and Lenses, 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.
Light: Mirrors and Lenses — important questions & MCQs with answers (Class 8 Science)
14 solved questions from this chapter's difficulty levels, each with its answer and explanation.
- Q1Easy
The bouncing back of light from a surface is called:
A.refractionB.absorptionC.dispersionD.reflection✓ CorrectAnswer: D. reflection
Explanation: Reflection is light bouncing back off a surface; refraction is bending as light passes into a different medium, and dispersion is light splitting into colours.
- Q2Easy
The image in a plane mirror is:
A.inverted and largerB.upside downC.smallerD.erect and the same size as the object✓ CorrectAnswer: D. erect and the same size as the object
Explanation: A plane mirror always forms an erect, same-size image of the object — never magnified, diminished, or inverted, unlike curved mirrors.
- Q3Easy
A mirror with a reflecting surface curved inwards is a:
A.convex mirrorB.concave mirror✓ CorrectC.plane mirrorD.flat mirrorAnswer: B. concave mirror
Explanation: A mirror whose reflecting surface curves inwards, like the bowl of a spoon, is a concave mirror.
- Q4Easy
A lens that is thicker in the middle than at the edges is a:
A.convex lens✓ CorrectB.concave lensC.plane mirrorD.flat glassAnswer: A. convex lens
Explanation: A lens thicker at the centre than at the edges is a convex lens, which converges the light rays passing through it.
- Q5Easy
The perpendicular drawn where a ray strikes a mirror is the:
A.incident rayB.reflected rayC.normal✓ CorrectD.imageAnswer: C. normal
Explanation: The normal is the perpendicular line drawn at the point where a ray strikes a mirror; both the angle of incidence and angle of reflection are measured from it.
- Q6Easy
The kind of image formed by a plane mirror is:
A.virtual (cannot be caught on a screen)✓ CorrectB.realC.on the mirror surfaceD.in front of the mirrorAnswer: A. virtual (cannot be caught on a screen)
Explanation: A plane mirror image is virtual: reflected rays only appear to come from behind the mirror, so the image cannot be projected onto a screen.
- Q7Medium
A ray strikes a mirror with an angle of incidence of 40°. The angle of reflection is:
A.40°✓ CorrectB.50°C.80°D.20°Answer: A. 40°
Explanation: The law of reflection makes the angle of reflection equal the angle of incidence, so a 40° incoming ray reflects at 40° too.
- Q8Medium
In a plane mirror, if you raise your right hand, the image raises its:
A.right handB.left hand (lateral inversion)✓ CorrectC.both handsD.no handAnswer: B. left hand (lateral inversion)
Explanation: Lateral inversion swaps left and right in a reflection, so a raised right hand appears as the mirror image's left hand.
- Q9Medium
A concave mirror can form a magnified, erect image when the object is:
A.close to the mirror✓ CorrectB.very far awayC.behind the mirrorD.at infinityAnswer: A. close to the mirror
Explanation: Held within its focal length, close to the mirror, a concave mirror produces a magnified, erect, virtual image — the principle behind shaving mirrors.
- Q10Medium
When an object is very close to a convex lens, its image looks:
A.inverted and smallB.the same sizeC.erect and enlarged✓ CorrectD.invisibleAnswer: C. erect and enlarged
Explanation: When an object sits within a convex lens's focal length, the lens forms an erect, enlarged virtual image — the magnifying-glass effect.
- Q11Medium
If the angle of reflection is 55°, the angle of incidence is:
A.55°✓ CorrectB.35°C.110°D.5°Answer: A. 55°
Explanation: Since the angle of reflection always equals the angle of incidence, a reflection angle of 55° means the ray struck the mirror at 55° as well.
- Q12Hard
A ray hits a mirror and the angle between the incident and reflected rays is 80°. The angle of incidence is:
A.40°✓ CorrectB.80°C.20°D.160°Answer: A. 40°
Explanation: The angle of incidence always equals the angle of reflection, so the two equal angles together span 80°, making each one 40°.
- Q13Hard
You stand 2 m from a plane mirror. Your image appears to be:
A.4 m behind the mirrorB.1 m behind the mirrorC.2 m behind the mirror✓ CorrectD.on the mirrorAnswer: C. 2 m behind the mirror
Explanation: A plane mirror places the image as far behind the mirror as the object is in front, so standing 2 m away puts the image 2 m behind the mirror.
- Q14Hard
Which correctly matches a mirror to its image?
A.convex mirror → always magnifiedB.convex mirror → always erect and diminished✓ CorrectC.plane mirror → invertedD.concave mirror → always smallerAnswer: B. convex mirror → always erect and diminished
Explanation: A convex mirror always gives an erect, diminished image, unlike a concave mirror, whose image can be magnified or inverted depending on distance.
Key concepts: Light: Mirrors and Lenses (Class 8 Science)
This chapter is about how mirrors and lenses form images of objects using light. Reflection obeys two laws — the angle of incidence equals the angle of reflection, and the incident ray, reflected ray and normal lie in one plane. A plane mirror forms an erect, same-size, virtual and laterally inverted image. Spherical mirrors are concave (converging — a magnified erect image when the object is close, used in torches and shaving mirrors) or convex (always erect and diminished with a wide view, used as rear-view mirrors). Lenses, which let light pass through and refract it, are convex (a magnifying glass) or concave (always erect and diminished).
- Reflection
- The bouncing back of light from a surface; it lets us see non-luminous objects by the light they reflect into our eyes.
- Laws of reflection
- First, the angle of incidence equals the angle of reflection; second, the incident ray, the reflected ray and the normal all lie in the same plane. They hold for all mirrors.
- Normal and angles
- The normal is the perpendicular at the point where the ray strikes; the angle of incidence and angle of reflection are both measured from this normal.
- Plane mirror image
- A plane mirror forms an erect, same-size, virtual image, as far behind the mirror as the object is in front, with left and right swapped (lateral inversion).
- Spherical mirrors
- Curved mirrors — concave surfaces curve inwards and convex surfaces curve outwards; both show lateral inversion.
- Concave mirror
- A converging mirror that forms a magnified, erect image when the object is close, and can focus parallel sunlight to a hot point — used in torches, headlights and shaving mirrors.
- Convex mirror
- A diverging mirror that always forms an erect, diminished image and gives a wide field of view — used as rear-view and security mirrors.
- Convex lens
- A lens thicker in the middle that converges light; used as a magnifying glass. A nearby object looks erect and enlarged, while a far object gives an inverted image.
- Concave lens
- A lens thicker at the edges that diverges light and always forms an erect, diminished image.
- Refraction through lenses
- Unlike mirrors, lenses let light pass through and bend (refract) it, which is how they form images.
- Regular vs diffuse reflection
- A smooth surface reflects light regularly to give a clear image, while a rough surface scatters it (diffuse reflection) so no clear image forms.
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Start this chapter free →Light: Mirrors and Lenses — FAQs
What are the key concepts in Class 8 Science Light: Mirrors and Lenses?+
This chapter is about how mirrors and lenses form images of objects using light. Reflection obeys two laws — the angle of incidence equals the angle of reflection, and the incident ray, reflected ray and normal lie in one plane. A plane mirror forms an erect, same-size, virtual and laterally inverted image. Spherical mirrors are concave (converging — a magnified erect image when the object is close, used in torches and shaving mirrors) or convex (always erect and diminished with a wide view, used as rear-view mirrors). Lenses, which let light pass through and refract it, are convex (a magnifying glass) or concave (always erect and diminished). Key ideas include Reflection, Laws of reflection, Normal and angles, Plane mirror image, Spherical mirrors, Concave mirror.
What does Class 8 Science Chapter 10 (Light: Mirrors and Lenses) cover on XamBaaz?+
It has 72 NCERT-based MCQs on "Light: Mirrors and Lenses": 24 Easy, 24 Medium and 24 Hard. Together they make 9 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: Mirrors and Lenses" questions free to practise?+
Yes. Sign in with Google to practise "Light: Mirrors and Lenses" free. Full unlimited access is ₹999/year. One year from the day you pay. You stay in Class 8 till 31 March; on 1 April your account moves up to Class 9 and the rest of your year carries over. No chapter is charged separately.
How should I revise "Light: Mirrors and Lenses" for the exam?+
Start with the Easy quiz to check your basics, then try Medium and Hard to practise applying them. There are 9 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: Mirrors and Lenses" 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: Mirrors and Lenses" 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: Mirrors and Lenses (Class 8 Science)?+
The questions that matter most test Reflection, Laws of reflection, Normal and angles, Plane mirror image, Spherical mirrors, Concave mirror. This page shows 14 solved important MCQs with answers and explanations. Sign in to practise all 72 questions on the chapter as timed quizzes.
Is there an online quiz for Light: Mirrors and Lenses?+
Yes — Class 8 Science Light: Mirrors and Lenses 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.