T.O - Rectilinear Propagation of Light (prelims)

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1. Full Illumination 2. Partial Illumination

2 Regions of illumination is formed if a beam of light coming from an EXTENDED source enters an aperture

1. Lunar Eclipse 2. Solar Eclipse

2 Types of Eclipse

1. Umbra 2. Penumbra

2 regions formed when Extended source is blocked by opaque object

Eclipse

A natural phenomenon which further demonstrates the Law of Rectilinear Propagation of Light

Umbra, total / absolute /geometric shadow

A point source blocked by an opaque object will produce a shadow known as ______, _____/_____, ______

Region of Illumination

Allowing light from a POINT source to ENTER an aperture will cast an image on the second screen

Similat triangles

Are pair of triangles which share a common APEX, wherein one triangle is photographic enlargement of the other

Similar triangles

Are used to solve problems involving rectilinear propagation of light

Partial illumination

Counterpart of Penumbra

Full illumination

Counterpart of Umbra

Shadows

Dark image formed by intercepting light rays

Penumbra

Derived from latin word "paene" which means nearly

A/b = a`/b`

Formula for Ratio and Proportion

Altitude

Height of the triangle

Smaller

If the OBJECT is moved closer to the screen, the shadow gets smaller

Bigger

If the SOURCE is moved closer, the shadow gets _____

Homogeneous and isotropic

In a _____ and ______ medium, light travels in straight line

Umbra

Latin word which means "shade"

Umbra

Light coming from POINT SOURCE will only form _____

Reflected, refracted or absorbed

Light travels in straight line as long as it is NOT _____, ______, or ______

Homogenous medium

Medium with same temperature, refracting index Ex. Air

Penumbra

Outer annular region of the shadow with partial illumination

Lunar Eclipse

Sun - earth - moon

Solar eclipse

Sun - moon - earth

Umbra

The central uniform dark region of the shadow with sharp border

Partial Illumination

The outer annular region of illumination with partial darkness

Full Illumination

The uniform central region of illumination


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