Physics: Light-Reflection and Refraction

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32 Terms

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reflection

phenomenon of light ray incident on a reflective/polished surface, bouncing back.

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Light travels through three types, which are

wave, straight line and matter

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Type of reflections (straight line)

  1. Reflection

  2. Refraction

  3. Dispersion

  4. Scattering

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Characteristics of image formed by a plane mirror

  1. Distance from the object and mirror is equal to the distance between the image formed and the mirror (u=v)

  2. Size of the object is the same as the same of the image formed.(ho=hi)

  3. The image formed in laterally inverted from the object

  4. The image formed is virtual (image cannot be captured on screen) and erect (same nothing changed)

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Spherical Mirror Definition

spherical mirrors are the reflecting surface which is a part of a sphere

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Two types of spherical mirrors

  1. Concave

  2. Convex

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Concave mirror and Convex mirror

Concave: The reflecting surface is curved inwards

Convex: The reflecting surface is curved outwards

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Terms related to spherical mirror.

explain

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Pole (P)

Centre of reflecting surface of a spherical mirror

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Centre of curvature (C)

The reflecting surface is part of a sphere, the centre of this sphere is called the centre of curvature

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Radius (R)

The distance between the centre of curvature to the pole

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Principal Axis

The straight line passing through the centre of curvature and the pole

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Principal Focus (F)

The point where all the reflected rays intersect on the principal axis

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Focal length (f)

The distance between principal focus and the pole

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Aperture

diameter of the reflected surface

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Relation between R and f

2f=R

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2 laws of reflection

  1. The angle of incidence is same as the angle of reflection

  2. The incident ray, normal and the reflected ray all lie on the same plane

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Rules of image formation in a spherical mirror

There are 4 rules and each applies to convex and concave mirrors.

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Rule 1 (Concave)

An incident ray parallel to the principal axis, after reflection will pass through the principal focus

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Rule 2 (Concave)

An incident ray passing through the principal focus, after reflection, will be parallel to the principal axis

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Rule 2 (Convex)

An incident ray which is directed at the principal focus, after reflection will be parallel to the principal axis

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Rule 3 (Concave)

An incident ray passing through the centre of curvature, will reflect back in the same path

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Rule 3 (Convex)

An incident directed at the centre of curvature will reflect back in the same path

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Rule 4 (both)

Any incident ray on a spherical mirror wil

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