Lenses — Flashcards
Kerala Board · Class 10 · Physics
24 flashcards for Lenses (Kerala Board Class 10 Physics) to test yourself on key terms and facts. Sample: "What is a lens? How does it differ from"
Interactive on Super Tutor
Studying Lenses? Get the full interactive chapter.
Quizzes, flashcards, AI doubt-solver and a step-by-step study plan — built for flashcards and more.
Free trial, no card needed.
What is a lens? How does it differ from a plain glass sheet?
Answer
A lens is a transparent medium in which each refracting surface is part of a sphere. Unlike a plain glass sheet, a lens can converge or diverge light rays due to its curved surfaces. A convex lens con…
Compare the characteristics of convex and concave lenses.
Answer
Convex lens: Thicker in the middle, converges light rays, can form real images, principal focus is real. Concave lens: Thinner in the middle (thicker at edges), diverges light rays, forms only virtual…
Define the following lens terms: Optic centre, Principal focus, Focal length, Aperture
Answer
Optic centre (O): Midpoint of the lens. Principal focus (F): Point where parallel rays converge (convex) or appear to diverge from (concave) after refraction. Focal length (f): Distance from optic cen…
How can you distinguish between a convex and concave lens by observing letters through them?
Answer
Move the lens sideways while observing letters: With convex lens - letters appear to move in opposite direction. With concave lens - letters appear to move in same direction as the lens movement. This…
State the three rules for ray diagram construction in convex lenses.
Answer
1) A ray parallel to optic axis passes through the principal focus after refraction. 2) A ray passing through optic centre goes straight without deviation. 3) A ray passing through the principal focus…
When an object is placed beyond 2F of a convex lens, describe the image formed.
Answer
Position: Between F and 2F on the other side. Characteristics: Real, inverted, diminished (smaller than object). This configuration is used in cameras and human eye to form images of distant objects.
What type of image is formed when an object is placed between F and the lens (convex)?
Answer
Position: Same side as object, beyond the object. Characteristics: Virtual, erect, magnified (larger than object). This is the principle behind magnifying glasses and simple microscopes.
What happens when an object is placed exactly at the principal focus of a convex lens?
Answer
The image is formed at infinity (very far away). The refracted rays are parallel and do not converge. Practically, a very large image is formed far from the lens. This principle is used in searchlight…
+16 more flashcards
Practise AllFrequently Asked Questions
What are the important topics in Lenses for Kerala Board Class 10 Physics?
How many flashcards are available for Lenses?
How should I revise Lenses for the Kerala Board Class 10 board exam?
Sources & Official References
- Kerala Board of Public Examinations — keralapareekshabhavan.in
- National Education Policy 2020 — education.gov.in
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
More resources for Lenses
For serious students
Get the full Lenses chapter — start free.
Quizzes, flashcards, an AI doubt solver and a study plan for Kerala Board Class 10 Physics. Free to start, no card needed.