p6 last

REVIEWER FOR PHYSICS

WAVE PROPERTIES OF LIGHT:

1.       REFLECTION - when a wave strikes an object and bounces back/off.

-         Bounces back the light.

2.       REFRACTION - bending of waves when passing from one medium to another.

-         caused by a change of speed.

-        refraction happens when a wave changes direction because it moves from one medium to another, changing its speed.

Ex: Rainbow -> Refract-Reflect-Refract.

3.       DIFFRACTION - bending of waves around a barrier.

-         depends on the wavelength and size of the opening barrier.

-        Diffraction occurs when a wave encounters an obstacle or passes through a narrow opening and then spreads out.

•        LUMINOUS – an ability to produce their own light. Ex: Sun, firefly, etc.

•        NON-LUMINOUS – an object that doesn’t have a light or can’t produce their own light

•        TRANSPARENT, TRANSLUSCENT, OPAQUE.

1.       TRANSPARENT – can see through.

-         light passes completely.

Ex: Water, and plastic.

2.       TRANSLUSCENT – some light passes through.

Ex: Sheet of paper.

3.       OPAQUE – no light passes through.

Ex: Table, and wall.

ypes of Mirrors and Their Uses

Mirrors are reflective surfaces that form images based on how light interacts with them. There are three main types:

Plane Mirrors

-        Forms a virtual image (not real; cannot be projected onto a screen).

-        The image is upright and the same size as the object.

-        The image appears to be behind the mirror at the same distance as the object in front of it.

 Common Uses:

1.      Household mirrors (bathroom, dressing mirrors).,

2.      Optical devices like periscopes.

Concave Mirrors (Converging Mirrors)

-        Curved inward like the inside of a spoon.

-        Can form real or virtual images depending on object position.

-        Real images are inverted and can be projected onto a screen.

-        Virtual images are upright and appear behind the mirror.

 Common Uses:

1.      Magnification: Used in makeup mirrors, dental mirrors.

2.      Focus Light: Used in telescopes, flashlights, solar cookers, and headlights.

Convex Mirrors (Diverging Mirrors)

-        Curved outward like the back of a spoon.

-        Always forms virtual, upright, and reduced images.

-        Provides a wide field of view.

 Common Uses:

1.      Security mirrors (stores, parking areas).

2.      Car side mirrors (“Objects in mirror are closer than they appear”).