🌈 Light and Shadow

Light and Shadow

Light Sources

Natural: Sun, stars, fire
Artificial: Bulb, LED, torch

Shadow Formation

Opaque objects block light → shadow
Depends on: Size of light, Distance of object from light & screen

Umbra (Total Shadow)

Darkest part of shadow
No light reaches this region

Penumbra (Partial Shadow)

Lighter shadow surrounding umbra
Partial light reaches this region

Pinhole Camera

Small hole acts as lens
Produces inverted image
Shows rectilinear propagation of light

Eclipses

Solar Eclipse: Moon’s shadow on Earth
Lunar Eclipse: Earth’s shadow on Moon

Applications

Telling time – Sundials ,Pinhole camera – Forms images, Art & photography – Adds depth and effects, Astronomy & safety – Eclipses, detecting objects.