Light – Reflection and Refraction MCQs – NCERT Science Class X Ch.9 | Academia Aeternum
NCERT / Science / Ch.9

Light – Reflection and Refraction

Mirrors · Lenses · Mirror Formula · Lens Formula · Power
MCQ Master Series — 50 expert questions across 3 difficulty tiers.

⚡ Start Quiz 📊 Analytics
50
Questions
5
Topics
24
CBSE Board
16
State Board
10
Olympiad Level
Question Intelligence

Quiz Analytics

A data-driven breakdown of all 50 questions by difficulty, exam origin and topic distribution.

📈 Distribution Overview

50
Total Questions
CBSE Board
24
State Board
16
Olympiad Level
10

🗂 Topic Coverage

Reflection & Mirrors
26%
Mirror Formula
18%
Refraction & Snell's Law
18%
Lenses
20%
Lens Formula & Power
18%
24
CBSE Board
16
State Board
10
Olympiad Level
Conceptual Framework

Key Concept Highlights

6 foundational pillars that power every question in this quiz. Understand these, and the answers follow naturally.

🪞
Reflection of Light
Laws: angle of incidence = angle of reflection, both rays and normal are coplanar. Concave mirror = converging; convex = diverging. Image types depend on object position.
📐
Mirror Formula
1/f = 1/v + 1/u. Sign convention: distances measured from pole; incident light direction is positive. Magnification m = −v/u = h'/h.
🌊
Refraction of Light
Bending of light at interface due to change in speed. Snell's law: n₁sinθ₁ = n₂sinθ₂. Light bends toward normal when entering denser medium.
🔭
Lenses
Convex lens (converging): thicker at centre. Concave lens (diverging): thinner at centre. Virtual focus for concave. Real/virtual images for convex depend on object position.
📏
Lens Formula & Power
1/f = 1/v − 1/u. Power P = 1/f(m). Unit: dioptre (D). For combination: P = P₁ + P₂ + … Convex has +ve power, concave has −ve power.
🌈
Refractive Index
n = c/v = sin i / sin r. Optical density ≠ mass density. Diamond has very high n (2.42). Total internal reflection when i > critical angle.
Pedagogical Value

Why MCQs Matter

Multiple-choice questions are not mere guessing games — they are the sharpest diagnostic tool available to a competitive exam aspirant.

WHY
  • Force precise recall — vague conceptual understanding gets exposed immediately
  • Train elimination logic, a critical skill in JEE where partial knowledge suffices
  • Mirror CBSE Board objective and JEE Main Paper 1 formats exactly
  • Build decisive exam temperament — no room for hesitation
  • Reveal misconceptions that long-answer formats often mask
  • Provide instant feedback loops for targeted revision
~14%

of CBSE Science — highest numerical weight in Physics section

Quick Reference

Important Formula Capsules

6 must-memorise equations that surface repeatedly across CBSE and JEE papers.

Mirror Formula
\[ \dfrac{1}{f} = \dfrac{1}{v} + \dfrac{1}{u} \]
Magnification (Mirror)
\[ m = -\dfrac{v}{u} = \dfrac{h'}{h} \]
Snell's Law
\[ n_1 \sin\theta_1 = n_2 \sin\theta_2 \]
Refractive Index
\[ n = \dfrac{c}{v} = \dfrac{\sin i}{\sin r} \]
Lens Formula
\[ \dfrac{1}{f} = \dfrac{1}{v} - \dfrac{1}{u} \]
Power of Lens
\[ P = \dfrac{1}{f(\text{m})} \quad \text{(Dioptre)} \]
Learning Outcomes

What You Will Learn

By completing this quiz set you will have exercised all the following competencies.

01 Locate images formed by concave and convex mirrors for 6 object positions
02 Apply the mirror formula and magnification formula to numerical problems
03 Explain Snell's law and calculate the refractive index of a medium
04 Locate images formed by convex and concave lenses for key object positions
05 Apply the lens formula and calculate the power of a lens
06 Calculate the combined power of lenses in contact
Exam Preparation

Strategy & Preparation Tips

5 evidence-based strategies to maximise your score in CBSE Boards and JEE.

01
Strategy
Sign Convention Drill
Every numerical error in optics traces back to a wrong sign. Write the New Cartesian sign convention 5 times and stick it above your desk.
02
Strategy
Ray Diagram for Every Case
Draw ray diagrams for all 6 mirror positions and 6 lens positions. CBSE always asks 2 mirror and 2 lens diagrams per exam.
03
Strategy
Formula Card
Both 1/f=1/v+1/u (mirror) and 1/f=1/v-1/u (lens) on the same card. The minus sign in lens formula is the most common error.
04
Strategy
Power = 100/f(cm)
When f is in cm, use P=100/f directly. Board exams often give f in cm — do not forget to convert or use this shortcut.
05
Strategy
Timed Numericals
Attempt 10 numerical MCQs under 8 minutes. Speed in optics numericals is essential for the 3-hour board exam.

Ready to Test Your Mastery?

50 questions  ·  Elapsed timer  ·  Instant scored results

⚡ Begin Light – Reflection and Refraction Quiz
🎯 Knowledge Check

Physics — Light - Reflection And Refraction

50 Questions Class 10 MCQs
1
Which of the following is a real image?
2
The image formed by a plane mirror is:
3
The radius of curvature (R) of a spherical mirror is 20 cm. What is its focal length (f)?
4
A ray parallel to the principal axis after reflection passes through:
5
For a convex mirror, the image formed is always:
6
When the object is at infinity, the image formed by a concave mirror is:
7
A concave mirror gives a real image of same size as the object when object is placed:
8
Magnification (m) produced by a mirror is given by:
9
If magnification is +1, the mirror is likely to be:
10
For a concave mirror, focal length is taken as:
11
Mirror formula is:
12
If object is placed at 10 cm in front of a concave mirror of f = 15 cm, image position will be:
13
If the image is formed on the screen, the image is:
14
Which type of mirror is used in a car’s rear-view mirror?
15
If the image is formed between F and P, it will be:
16
The bending of light when it passes from one medium to another is called:
17
When light travels from air to glass:
18
Refractive index (n) of a medium is defined as:
19
A convex lens is also called:
20
A concave lens always produces:
21
Principal focus of a concave lens is:
22
A ray passing through optical centre of a lens:
23
Lens formula is:
24
Magnification by a lens is given by:
25
A convex lens of focal length 10 cm forms a real image at 20 cm. The object is at:
26
Concave mirrors are used in:
27
Convex lenses are used in:
28
Which of the following is used by dentists to see enlarged image of teeth?
29
Which law of refraction relates angle of incidence and refraction?
30
For light from air to water, refractive index is greater than 1 because:
31
If refractive index of glass = 1.5, speed of light in glass is:
32
A convex lens of power +5 D has focal length:
33
The power of a concave lens of focal length 50 cm is:
34
When object is between F1 and O in a convex lens, image is:
35
When object is at infinity for convex lens:
36
Concave lens of focal length 15 cm ? rays appear to diverge from:
37
Unit of power of lens:
38
Image formed by concave mirror when object is beyond C:
39
Refraction occurs because:
40
A parallel beam after refraction through convex lens meets at:
41
If u = -30 cm and f = +10 cm for convex lens, find v:
42
A concave mirror with f = -15 cm, object at u = -10 cm ? image:
43
If m = +2, the image is:
44
When an object is placed at focus of convex lens, image is:
45
For concave mirror, object at focus ? image at:
46
The ratio of speed of light in air to water = 4/3. Then refractive index of water is:
47
Critical angle is:
48
Convex mirrors are preferred for rear-view because:
49
Power of a lens depends on:
50
Unit of focal length when power in dioptres:
📚
ACADEMIA AETERNUM तमसो मा ज्योतिर्गमय · Est. 2025
Sharing this chapter
Test Yourself: Light MCQs Class 10 (Reflection & Refraction)
Test Yourself: Light MCQs Class 10 (Reflection & Refraction) — Complete Notes & Solutions · academia-aeternum.com
Explore Class 10 Science Chapter 9 – Light: Reflection and Refraction through 50 well-crafted True/False questions with answers and detailed explanations. Strengthen your understanding of mirrors, lenses, and image formation. Perfect for CBSE board exam preparation and quick concept revision.
🎓 Class 10 📐 Science 📖 NCERT ✅ Free Access 🏆 CBSE · JEE
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Frequently Asked Questions

The law of reflection states that the angle of incidence is equal to the angle of reflection, and the incident ray, reflected ray, and the normal all lie in the same plane.

Regular reflection occurs on smooth surfaces and produces clear images, while diffused reflection occurs on rough surfaces, scattering light in all directions without forming a clear image.

It is the ratio of the speed of light in vacuum to its speed in a medium. It tells how much light bends when entering a medium.

Due to refraction, light bends when it moves from water to air, making the pencil appear bent or displaced at the surface.

Plane mirror – used in dressing mirrors; Concave mirror – used by dentists and in torches; Convex mirror – used in vehicle rear-view mirrors.

Refraction helps in lenses, spectacles, cameras, microscopes, rainbows, and apparent bending of submerged objects.

It is the distance between the pole (or optical center) and the focus where parallel rays of light converge or appear to diverge.

Mirror formula: \( \frac{1}{f} = \frac{1}{v} + \frac{1}{u} \); Magnification formula: \( m = \frac{h_i}{h_o} = -\frac{v}{u} \).

When light travels from a denser to a rarer medium and the angle of incidence exceeds the critical angle, it reflects completely within the denser medium.

Real images are formed when rays actually meet and can be projected; virtual images are formed when rays appear to meet and cannot be projected.

Concave lenses correct myopia (short-sightedness), while convex lenses are used in magnifiers, cameras, and microscopes.

Stars twinkle due to atmospheric refraction of their light; planets do not because they are closer and appear as extended light sources.

The power of a lens (P) is the reciprocal of its focal length (f in meters): \( P = \frac{1}{f} \); its SI unit is the diopter (D).

The light ray refracts twice and emerges parallel to the original ray but is laterally displaced.

Distances measured against the direction of incident light are positive, and those measured along it are negative. All distances are measured from the pole or optical center.

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    Light - Reflection and Refraction — Learning Resources

    📄 Detailed Notes
    ✔️ True / False
    📌 Exercise
    💬 Q&A Discussion
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    Light - Reflection and Refraction-Exercise
    📚
    ACADEMIA AETERNUM तमसो मा ज्योतिर्गमय · Est. 2025
    Sharing this chapter
    Test Yourself: Light MCQs Class 10 (Reflection & Refraction)
    Test Yourself: Light MCQs Class 10 (Reflection & Refraction) — Complete Notes & Solutions · academia-aeternum.com
    Explore Class 10 Science Chapter 9 – Light: Reflection and Refraction through 50 well-crafted True/False questions with answers and detailed explanations. Strengthen your understanding of mirrors, lenses, and image formation. Perfect for CBSE board exam preparation and quick concept revision.
    🎓 Class 10 📐 Science 📖 NCERT ✅ Free Access 🏆 CBSE · JEE
    Share on
    WhatsApp
    Telegram
    X / Twitter
    Facebook
    Instagram
    Threads
    Pinterest
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    Quora
    Discord
    Reddit
    Email
    academia-aeternum.com/class-10/science/light-reflection-and-refraction/mcqs/ Copy link
    💡
    Exam tip: Sharing chapter notes with your study group creates a reinforcement loop. Teaching a concept is the fastest path to mastering it.

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