Light – Reflection and Refraction — Flashcards
Karnataka Board · Class 10 · Science
20 flashcards for Light – Reflection and Refraction (Karnataka Board Class 10 Science) to test yourself on key terms and facts.
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Why does a pencil appear bent when placed in a glass of water?
Answer
Light travels at different speeds in air and water. When light rays from the pencil pass from water to air, they bend away from the normal due to refraction. This bending makes the pencil appear displ…
A concave mirror has a focal length of 20 cm. If an object is placed 30 cm from the mirror, where will the image be formed?
Answer
Using mirror formula: 1/v + 1/u = 1/f Given: f = -20 cm, u = -30 cm 1/v = 1/f - 1/u = 1/(-20) - 1/(-30) = -1/20 + 1/30 = -1/60 Therefore, v = -60 cm The image is formed 60 cm in front of the mirror, r…
What happens when parallel rays of light fall on a convex mirror?
Answer
When parallel rays of light fall on a convex mirror, they reflect and appear to diverge from a point behind the mirror called the principal focus. The reflected rays spread out, making the mirror usef…
Refractive Index
Answer
The ratio of the speed of light in vacuum (or air) to the speed of light in a given medium. It measures how much light bends when entering the medium. Formula: n = c/v, where c is speed of light in ai…
Why do stars twinkle while planets don't?
Answer
Stars are point sources of light very far away. Their light passes through different layers of Earth's atmosphere with varying densities, causing refraction that changes the apparent position and brig…
A convex lens has a focal length of 15 cm. An object is placed 10 cm from the lens. Find the image distance and magnification.
Answer
Using lens formula: 1/v - 1/u = 1/f Given: f = +15 cm, u = -10 cm 1/v = 1/f + 1/u = 1/15 + 1/(-10) = 1/15 - 1/10 = -1/30 v = -30 cm Magnification m = v/u = (-30)/(-10) = +3 Image is virtual, erect, an…
How does a magnifying glass work?
Answer
A magnifying glass is a convex lens. When an object is placed between the lens and its focus, the lens forms a virtual, erect, and enlarged image. The object appears bigger because the image is formed…
Laws of Reflection
Answer
1. The angle of incidence equals the angle of reflection (i = r) 2. The incident ray, reflected ray, and normal to the surface all lie in the same plane These laws apply to all reflecting surfaces inc…
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Sources & Official References
- Karnataka SSLC — kseeb.kar.nic.in
- Dept of Pre-University Education, Karnataka
- National Education Policy 2020 — education.gov.in
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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