Reflection of light at curved surfaces
Telangana Board · Class 10 · Physical Sciences
Flashcards for Reflection of light at curved surfaces — Telangana Board Class 10 Physical Sciences. Quick Q&A cards covering key concepts, definitions, and formulas.
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What is a concave mirror?
Answer
A concave mirror is a spherical mirror curved like a surface bent inwards. It acts as a converging mirror because reflected rays meet at a point.
What is a convex mirror?
Answer
A convex mirror is a spherical mirror curved like a surface bent outwards. It acts as a diverging mirror because reflected rays spread out after reflection.
What is the pole of a spherical mirror?
Answer
The pole is the geometrical centre of the mirror. All mirror distances are measured from the pole.
What is the centre of curvature of a concave mirror?
Answer
The centre of curvature is the point where all normals to a concave mirror converge. It is the centre of the sphere of which the mirror is a part.
What is the principal axis of a spherical mirror?
Answer
The principal axis is the horizontal line passing through the pole and the centre of curvature.
What is the focal point of a concave mirror?
Answer
It is the point where parallel rays, such as sunlight, converge after reflection from a concave mirror.
How are focal length and radius of curvature related?
Answer
The radius of curvature is twice the focal length. The relation is R = 2f.
Why do parallel rays from the Sun help in finding the focal point of a concave mirror?
Answer
Sunlight reaching Earth is treated as parallel rays because the Sun is very far away. A concave mirror brings these rays together at its focus, making the focal point easy to locate.
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