Light: Mirrors and Lenses
CBSE · Class 8 · Science
Flashcards for Light: Mirrors and Lenses — CBSE Class 8 Science. Quick Q&A cards covering key concepts, definitions, and formulas.
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What is a spherical mirror and what are its two types?
Answer
A spherical mirror is a curved mirror shaped like a part of a hollow glass sphere. There are two types: 1) Concave mirror - reflecting surface curves inward 2) Convex mirror - reflecting surface curve…
How can you distinguish between a concave and convex mirror by looking at them?
Answer
When viewed from the side at mirror level: Concave mirror - the reflecting surface curves inward (like the inner side of a spoon). Convex mirror - the reflecting surface curves outward (like the outer…
What type of image does a concave mirror form when an object is placed close to it?
Answer
When an object is placed close to a concave mirror, it forms an erect (upright) and enlarged image. As the object moves farther away, the image becomes inverted and changes in size.
What type of image does a convex mirror always form?
Answer
A convex mirror always forms an erect (upright) and diminished (smaller) image regardless of the object's position. The image becomes slightly smaller as the object moves farther away.
State the first law of reflection.
Answer
The angle of incidence (i) is equal to the angle of reflection (r). This means the angle at which light hits the mirror equals the angle at which it bounces off.
State the second law of reflection.
Answer
The incident ray, the normal to the mirror at the point of incidence, and the reflected ray all lie in the same plane. This means all three elements are flat on the same surface.
Define: incident ray, reflected ray, and normal.
Answer
Incident ray - the ray of light falling on the mirror. Reflected ray - the ray of light coming back from the mirror. Normal - a line perpendicular (90°) to the mirror surface at the point where light …
What happens when parallel rays of light fall on a concave mirror?
Answer
When parallel rays fall on a concave mirror, the reflected rays converge (come together). This is why concave mirrors are also called converging mirrors.
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Sources & Official References
- NCERT Official — ncert.nic.in
- CBSE Academic — cbseacademic.nic.in
- CBSE Official — cbse.gov.in
- National Education Policy 2020 — education.gov.in
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