Reflection of Light: Spherical Mirrors — Chapter Summary
ICSE · Class 12 · Physics
Summary of Reflection of Light: Spherical Mirrors for ICSE Class 12 Physics. Part of the ICSE Class 12 Physics syllabus.
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Overview
Reflection in spherical mirrors is the regular bouncing back of light from a curved reflecting surface. A spherical mirror is a part of a hollow sphere and may be concave or convex. Concave mirrors can form real or virtual images depending on object position, while convex mirrors always form virtual
Key Concepts
A concave mirror has its reflecting
A concave mirror has its reflecting surface towards the centre of the sphere of which the mirror is a part. Its focus is real and lies in front of the
A convex mirror has its reflecting
A convex mirror has its reflecting surface away from the centre of the sphere of which the mirror is a part. Its focus is virtual and lies behind the
The pole is the central point
The pole is the central point of the reflecting surface. The centre of curvature is the centre of the sphere of which the mirror forms a part. The pri
The principal focus is the point
The principal focus is the point on the principal axis where rays parallel to the principal axis actually meet after reflection in a concave mirror or
Paraxial rays are close to
Paraxial rays are close to the principal axis. Marginal rays are far from the principal axis. Most mirror derivations are valid only for paraxial rays
Learning Objectives
- Identify concave and convex spherical mirrors and their basic parts
- Use the terms pole, centre of curvature, principal axis, principal focus, focal length, and aperture correctly
- Apply the rule that a line from the centre of curvature to the mirror is normal to the mirror
- Trace images using the standard rays for spherical mirrors
- Use the New Cartesian sign convention for distances and lengths
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