Questions and Answers
What is the speed of light in vacuum?
3 x 10⁸ m/s
What is a concave mirror?
A spherical mirror whose reflecting surface is curved inwards.
What is a convex mirror?
A spherical mirror whose reflecting surface is curved outwards.
How do we see objects?
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What is the centre of the reflecting surface called?
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What is the center of curvature?
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What is the radius of curvature?
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What is the principal focus?
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What is the focal length?
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What are the characteristic properties of the image formed by a concave mirror when the object is at infinity?
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What are the characteristic properties of the image formed by a concave mirror when the object is between infinity and the center of curvature?
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What are the characteristic properties of the image formed when the object is placed at the center of curvature in front of a concave mirror?
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What are the characteristic properties of the image formed when the object is placed between the principal focus and the center of curvature?
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What are the characteristic properties of the image formed when the object is placed at the principal focus in front of a concave mirror?
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What are the characteristic properties of the image formed when the object is placed between the pole and the principal focus in front of a concave mirror?
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What are the characteristic properties of the image formed when the object is at infinity in the case of a convex mirror?
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What are the characteristic properties of the image formed when the object is placed anywhere between the pole and infinity in front of a convex mirror?
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What are real images?
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What are virtual images?
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What do concave mirrors act as?
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Can you name some uses of concave mirrors?
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Study Notes
Speed of Light
- Speed of light in vacuum is approximately 3 x 10⁸ m/s.
Types of Mirrors
- Concave Mirror: Spherical mirror with an inward-curved reflecting surface, facing the sphere's center.
- Convex Mirror: Spherical mirror with an outward-curved reflecting surface.
Light Perception
- Objects reflect light that falls on them, allowing us to see when reflected light reaches our eyes.
Mirror Components
- Pole (P): Geometric center of the curved mirror, referred to as the center of the reflecting surface.
- Center of Curvature (C): Center of the sphere from which the mirror segment is derived.
- Radius of Curvature (R): Radius of the sphere of which the curved mirror is part.
- Principal Focus (F): Point where parallel light rays converge (concave mirror) or appear to diverge (convex mirror).
- Focal Length: Distance from the pole (P) to the principal focus (F) of the curved mirror.
Image Formation in Concave Mirrors
- At Infinity: Real, inverted, highly diminished image formed at the principal focus.
- Between Infinity and Center of Curvature: Real, inverted, diminished image formed between the principal focus and center of curvature.
- At Center of Curvature: Real, inverted image of same size as object, formed at center of curvature.
- Between Principal Focus and Center of Curvature: Real, inverted, enlarged image formed beyond the center of curvature.
- At Principal Focus: Real, inverted, highly enlarged image formed at infinity.
- Between Pole and Principal Focus: Virtual, erect, enlarged image formed behind the mirror.
Image Formation in Convex Mirrors
- At Infinity: Virtual, erect, highly diminished image formed at the principal focus behind the mirror.
- Between Pole and Infinity: Virtual, erect, diminished image formed between the principal focus and pole behind the convex mirror.
Types of Images
- Real Images: Always inverted, can be projected on a screen. Typically produced by concave mirrors, except when objects are between the pole and the principal focus.
- Virtual Images: Always erect, cannot be projected on a screen. Produced by convex mirrors.
Functionality of Mirrors
- Concave mirrors function as converging mirrors, focusing light.
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Description
Test your knowledge with these flashcards on the key concepts of light, reflection, and refraction from Chapter 10 of Class 10 Science. Understand essential terminologies such as speed of light, concave and convex mirrors, and how we perceive objects. Enhance your learning and retention of these fundamental physics concepts.
