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Refraction through a lens — Flashcards

ICSE · Class 10 · Physics

36 flashcards for Refraction through a lens (ICSE Class 10 Physics) to test yourself on key terms and facts. Sample: "State the definition of a lens."

42 questions36 flashcards5 concepts

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An illustration showing the different types of convex lenses (equi-convex, plano-convex, concavo-convex) and concave lenses (equi-concave, plano-concave, convexo-concave), highlighting their shapes an
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36 Flashcards·
Lens basicsConvex lensConcave lensSpecial lens typesLens termsFocal pointsFocal length
Card 1Lens basics

State the definition of a lens.

Answer

A lens is a transparent homogeneous refracting medium bounded by either two curved surfaces or one plane surface and one curved surface.

Card 2Convex lens

How is a convex lens identified by shape and action?

Answer

A convex lens is thicker in the middle and thinner at its periphery. It converges a beam of light, so it is also called a converging lens.

Card 3Concave lens

How is a concave lens identified by shape and action?

Answer

A concave lens is thinner in the middle and thicker at the periphery. It diverges a beam of light, so it is also called a diverging lens.

Card 4Special lens types

What is the difference between concavo-convex and convexo-concave lenses?

Answer

A concavo-convex lens has one convex and one concave surface and has converging nature. A convexo-concave lens has one convex and one concave surface and has diverging nature.

Card 5Lens terms

What is the optical centre of a lens?

Answer

The optical centre is the point through which a ray passes without any deviation, if the lens is thin.

Card 6Focal points

Define first focal point F1 for a convex lens and a concave lens.

Answer

For a convex lens, F1 is the point from where a divergent beam becomes parallel after refraction. For a concave lens, F1 is the point at which a convergent beam appears to meet and then becomes parall…

Card 7Focal points

Define second focal point F2 for a convex lens and a concave lens.

Answer

For a convex lens, F2 is the point where a parallel beam converges after refraction. For a concave lens, F2 is the point from which a parallel beam appears to diverge after refraction.

Card 8Focal length

State the relation between first and second focal lengths when the medium on both sides of the lens is the same.

Answer

If the medium on both sides of the lens is same, then the first and second focal lengths are numerically equal: f1 = f2.

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Frequently Asked Questions

What are the important topics in Refraction through a lens for ICSE Class 10 Physics?
Key topics in Refraction through a lens include Lens and its types, Focal points, focal length, and image behaviour, Factors affecting focal length and power of a lens, Sign convention, lens formula, and magnification. Study these first, then practise questions on each for the ICSE Class 10 board exam.
How many flashcards are available for Refraction through a lens?
There are 36 flashcards for Refraction through a lens covering key definitions, facts and ideas. A few sample cards are shown on this page.
How should I revise Refraction through a lens for the ICSE Class 10 board exam?
Learn the core ideas first, then work through the 42 practice questions on Refraction through a lens. Revise definitions regularly and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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