Refraction Through a Lens Assertion and Reasoning Questions for ICSE Class 10 Physics Chapter 5

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Last Updated on April 12, 2025 by sanjjeett

Hello students, we are providing assertion and reasoning questions for ICSE class 10 physics. Assertion and reasoning questions are the new question format that is introduced in CISCE (ICSE and ISC) board. The resources for ICSE assertion and reasoning questions are very less. So, to help icse board students we have created chapterwise assertion and reasoning questions for class 10 physics. In this article, you will find assertion and reasoning questions for ICSE Class 10 Physics Chapter 5 Refraction Through a Lens.

Chapter	Refraction Through a Lens
Type of Questions	Assertion and Reasoning Questions
Nature of Questions	Competency Based Questions
Board	ICSE
Class	10
Subject	Physics
Unit	Unit 2 Light
Useful for	Class 10 Studying Students
Answers provided	Yes
Difficulty level	Mentioned
Important Link	ICSE Class 10 Physics Chapterwise Assertion Reasoning

Assertion and Reasoning Questions on Refraction Through a Lens for ICSE Class 10 Physics

Assertion and reasoning questions are also known as assertion reason questions. Assertion-Reason questions are a type of question format used in ICSE exams where two statements are provided: an Assertion (A) and a Reason (R). Students need to determine whether each statement is true or false and if the Reason correctly explains the Assertion.

Directions: Each question consists of two statements – an Assertion (A) and a Reason (R). Choose the correct option:
(a) Both assertion and reason are true.
(b) Both assertion and reason are false.
(c) Assertion is false but reason is true.
(d) Assertion is true but reason is false.

Q1. Assertion (A): A convex lens always forms a real and inverted image.
Reason (R): A convex lens converges the light rays passing through it.

Ans.: (d)

Q2. Assertion (A): A concave lens always forms a virtual, erect, and diminished image.
Reason (R): Concave lenses diverge parallel rays of light.

Ans.: (a)

Q3. Assertion (A): The focal length of a concave lens is always positive.
Reason (R): Concave lenses diverge light and thus have a positive focal length.

Ans.: (d)

Q4. Assertion (A): The image formed by a convex lens when the object is placed at the focus is virtual and erect.
Reason (R): The rays after refraction diverge and do not meet.

Ans.: (b)

Q5. Assertion (A): Lens formula is the same for both convex and concave lenses.
Reason (R): The sign convention applied determines the nature of the image.

Ans.: (a)

Q6. Assertion (A): If the object is placed between the focus and optical centre of a convex lens, the image is magnified and virtual.
Reason (R): In this position, the refracted rays appear to diverge from a point.

Ans.: (a)

Q7. Assertion (A): The power of a concave lens is negative.
Reason (R): The focal length of a concave lens is negative in sign convention.

Ans.: (a)

Q8. Assertion (A): When a convex lens forms a real image, magnification is always negative.
Reason (R): Real images are always inverted in nature.

Ans.: (a)

Q9. Assertion (A): Two convex lenses in contact will always act like a concave lens.
Reason (R): The effective focal length of two convex lenses is negative.

Ans.: (b)

Q10. Assertion (A): A concave lens can form a real image only if the object is placed beyond 2F.
Reason (R): A concave lens always diverges light rays and cannot produce a real image.

Ans.: (c)

Q11. Assertion (A): When an object is placed at 2F in front of a convex lens, the image is formed at 2F on the other side.
Reason (R): This image is real, inverted, and same in size as the object.

Ans.: (a)

Q12. Assertion (A): A convex lens of power +4 D has a focal length of 25 cm.
Reason (R): Power P=100/f (in cm) applies to both convex and concave lenses.

Ans.: (a)

We hope the given ICSE assertion reasoning questions for Refraction Through a Lens helps you in your learning.

Also check

• Spectrum Assertion and Reasoning Questions for ICSE Class 10 Physics Chapter 6
• Refraction Through a Lens Assertion and Reasoning Questions for ICSE Class 10 Physics Chapter 5
• Refraction of Light at Plane Surfaces Assertion and Reasoning Questions for ICSE Class 10 Physics Chapter 4
• Machines Assertion and Reasoning Questions for ICSE Class 10 Physics Chapter 3
• Force Assertion and Reasoning Questions for ICSE Class 10 Physics Chapter 1
• Work, Energy and Power Assertion and Reasoning Questions for ICSE Class 10 Physics Chapter 2

Topics from which assertion reasoning questions may be asked

• Types of lenses – convex and concave
• Ray diagrams and image formation
• Sign convention for lenses
• Lens formula
• Magnification
• Power of a lens
• Combination of lenses

Assertion and reasoning questions based on above topics may be asked.

Topics found difficult by students

• Numerical problems based on light using sign convention.
• Identification of lenses when virtual images are formed.
• Change in the focal length when the refractive index of the outside medium changes.
• Ray diagrams of lenses.
• Numerical problem on lens formula.
• It is also observed that in ray diagrams in spite of knowing diagrams students loose marks as they don’t draw arrows on rays before and after refraction and don’t draw dotted line for virtual intersection or image.
• The ability to diverge or converge with respect to the focal length.

These are the topics from chapter Refraction Through a Lens, generally found difficult by students studying in ICSE Class 10 Physics.

Frequently Asked Questions (FAQs) on Refraction Through a Lens ICSE Class 10 Physics Assertion and Reasoning Questions