Class 7 Science Light MCQ – Reflection, Lenses & White Light

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Practice Class 7 Science Light MCQ Questions with Answers based on NCERT concepts. Learn about white light, real images, reflection, convex lenses and plane mirror images with clear exam-focused explanations.

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Chapter Information

• Subject: Science
• Class: 7
• Topic: Light
• Question Type: Multiple Choice Questions (MCQs)
• Difficulty Level: Easy to Moderate
• Based On: NCERT Class 7 Science Concepts

Introduction

Light is an important part of everyday life and helps us see the world around us. This Class 7 Science MCQ practice set covers important concepts related to white light, reflection, mirrors, lenses and image formation.

Each question includes a Concept / Exam Explanation to help students understand the concept instead of simply memorising the answer.

What You Will Learn

✔ Composition of white light
✔ Real image formation
✔ Reflection of light
✔ Convex and concave lenses
✔ Image formed by a plane mirror

Why This Topic Is Important

Understanding light, mirrors and lenses helps students explain many everyday optical phenomena. These concepts also provide a foundation for studying more advanced topics in higher classes.

Q1. The process of change in the direction of light by a mirror is called:

A) $$\text{Refraction}$$

B) $$\text{Reflection}$$

C) $$\text{Absorption}$$

D) $$\text{Dispersion}$$

Answer:

$$\text{Reflection}$$

Concept / Exam Explanation:

When light falls on a surface such as a mirror and returns into the same medium after changing its direction, the process is called reflection of light.

A mirror reflects a significant portion of the light falling on its surface.

Exam Tip:

Remember:

$$\boxed{\text{Mirror} \rightarrow \text{Reflection}}$$

Step-by-step explanation:

1. Light travels in a straight line.
2. When light hits a mirror, it bounces back.
3. This bouncing back of light is called Reflection.
4. A mirror changes the direction of light, not its medium.

Conclusion:
Change in direction of light by a mirror = Reflection.

Q2. Which of the following can form a real image?

A) $$\text{Concave mirror}$$

B) $$\text{Convex lens only}$$

C) $$\text{Plane mirror}$$

D) $$\text{Convex mirror}$$

Answer:

$$\text{Concave mirror}$$

Concept / Exam Explanation:

A concave mirror can form a real image when the object is placed beyond its focus. A real image is formed when reflected light rays actually meet at a point.

A plane mirror and convex mirror normally form virtual images.

Exam Tip:

A concave mirror can produce both real and virtual images, depending on the position of the object.

explanation:

1. A real image is formed when light rays actually meet.
2. Plane mirror → always forms virtual image.
3. Convex mirror → always forms virtual image.
4. Concave mirror can form:
   • Real image (when object is far)
   • Virtual image (when object is very close)

Conclusion:
Only concave mirror can form a real image (in given options).

Q3. The image formed by a plane mirror is always:

A) $$\text{Virtual and inverted}$$

B) $$\text{Real and inverted}$$

C) $$\text{Virtual and erect}$$

D) $$\text{Real and erect}$$

Answer:

$$\text{Virtual and erect}$$

Concept / Exam Explanation:

A plane mirror forms a virtual and erect image. The image appears behind the mirror and cannot be obtained on a screen.

The image is also generally the same size as the object and appears at the same distance behind the mirror as the object is in front of it.

Exam Tip:

Remember the key properties:

$$\boxed{\text{Plane mirror} \rightarrow \text{Virtual + Erect}}$$

explanation:

1. A plane mirror forms an image behind the mirror.
2. The image cannot be captured on a screen → virtual.
3. The image is upright → erect.
4. It is also same size and laterally inverted (left-right reversed).

Conclusion:
Plane mirror always forms virtual and erect image.

Q4. A lens which feels thicker in the middle than at the edges is a:

A) $$\text{Bifocal lens}$$

B) $$\text{Concave lens}$$

C) $$\text{Plane lens}$$

D) $$\text{Convex lens}$$

Answer:

$$\text{Convex lens}$$

Concept / Exam Explanation:

A convex lens is generally thicker at the centre and thinner at the edges. It bends parallel light rays towards one another and is therefore also called a converging lens.

Exam Tip:

Remember: $$\boxed{\text{Convex lens} \rightarrow \text{Thicker in the middle}}$$

explanation:

1. Lenses are of two main types: concave and convex.
2. A convex lens is thicker at the center and thinner at edges.
3. It converges (focuses) light rays to a point.
4. A concave lens is thinner at the center (opposite shape).

Conclusion:
Lens thicker in the middle = Convex lens.

Q5. White light is composed of how many colors?

A) $$\text{Six}$$

B) $$\text{Five}$$

C) $$\text{Seven}$$

D) $$\text{Eight}$$

Answer:

$$\text{Seven}$$

Concept / Exam Explanation:

White light is made up of seven visible colours. When white light passes through a prism, these colours can separate and form a spectrum.

The seven colours are commonly remembered as:

$$\text{VIBGYOR}$$

where VIBGYOR represents:

Violet, Indigo, Blue, Green, Yellow, Orange and Red.

Exam Tip:

Remember:

$$\boxed{\text{White light} \rightarrow 7\text{ colours}}$$

explanation:

1. White light is a mixture of different colors.
2. When it passes through a prism, it splits into colors.
3. This process is called Dispersion of light.
4. The colors are: VIBGYOR
   • Violet, Indigo, Blue, Green, Yellow, Orange, Red

Conclusion:
White light is made up of 7 colors.

Important Concepts

1. White Light

White light consists of seven visible colours:

$$\text{VIBGYOR}$$

2. Concave Mirror

A concave mirror can form real or virtual images depending on the object’s position.

3. Reflection

The change in direction of light when it returns from a reflecting surface is called reflection.

4. Convex Lens

A convex lens is thicker at the centre and thinner at the edges.

5. Plane Mirror

A plane mirror produces a virtual and erect image.

Related Practice Questions

1. What are the seven colours present in white light?
2. Which type of mirror is commonly used as a rear-view mirror?
3. What is the difference between reflection and refraction?
4. Which lens is thinner at the centre and thicker at the edges?
5. What is the size of the image formed by a plane mirror compared with the object?

Mini Quiz Challenge

1. Which lens is thicker at the centre?

A) Concave lens
B) Convex lens
C) Plane lens
D) None of these

Answer: $$\text{Convex lens}$$

2. How many colours are present in white light?

A) 5
B) 6
C) 7
D) 8

Answer: $$7$$

3. Which process occurs when light falls on a mirror and returns?

A) Reflection
B) Refraction
C) Absorption
D) Dispersion

Answer: $$\text{Reflection}$$

Exam Tips

✔ Remember the seven colours of white light using VIBGYOR.
✔ Learn the difference between concave and convex mirrors.
✔ Remember that reflection is associated with mirrors.
✔ A convex lens is thicker in the middle.
✔ A plane mirror forms a virtual and erect image.

Quick Revision Notes

✔ White light → Seven colours
✔ Real image can be formed by → Concave mirror
✔ Mirror → Reflection
✔ Thicker in the middle → Convex lens
✔ Plane mirror → Virtual and erect image

Common Mistakes Students Make

❌ Confusing reflection with refraction.
❌ Assuming every mirror forms a real image.
❌ Confusing convex and concave lenses.
❌ Forgetting that a plane mirror forms a virtual image.
❌ Giving six instead of seven as the number of colours in white light.

Key Takeaways

• White light contains seven visible colours.
• A concave mirror can form a real image under suitable conditions.
• A mirror changes the direction of light through reflection.
• A convex lens is thicker in the middle.
• A plane mirror forms a virtual and erect image.

FAQs

1. How many colours make up white light?

White light is commonly described as containing seven colours.

2. Which mirror can form a real image?

A concave mirror can form a real image when the object is placed appropriately.

3. What is reflection of light?

Reflection is the return of light into the same medium after it strikes a reflecting surface.

4. Which lens is thicker at the centre?

A convex lens is thicker at the centre and thinner at the edges.

5. What type of image does a plane mirror form?

A plane mirror forms a virtual and erect image.

NCERT Reference

This practice set is based on concepts from the NCERT Class 7 Science curriculum, particularly the topic Light.

The questions, explanations, exam tips, revision notes, FAQs and other supporting content have been originally written for educational practice and do not reproduce textbook passages.

Related links

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