Reflection of Light
What happens when light hits a smooth, shiny surface?
It reflects in one direction (regular reflection).
What is refraction of light?
The bending of light when it passes from one medium to another.
What is dispersion of light?
Splitting white light into its seven colours.
What are asteroids made of?
Rock and metal.
What is a galaxy?
A huge collection of stars, gas, and dust held together by gravity.
State the law of reflection.
Angle of incidence = angle of reflection.
Does light speed up or slow down when it enters a denser medium?
It slows down.
Which device can show dispersion of light?
A glass prism.
Where is the asteroid belt located?
Between Mars and Jupiter.
What is the name of our galaxy?
The Milky Way.
Why can you see your face clearly in a mirror but not on a wall?
A mirror gives regular reflection; a wall scatters light.
Explain why a pencil in a glass of water looks bent.
Light rays change direction due to refraction at the water–air surface.
Name the seven colours of the spectrum.
Red, Orange, Yellow, Green, Blue, Indigo, Violet (ROYGBIV).
What force keeps planets orbiting the Sun and stars together in a galaxy?
Gravity
What is the shape of the Milky Way Galaxy?
Spiral shape.
What are the incident ray, reflected ray, and normal?
Incident ray = incoming light; Reflected ray = bounced light; Normal = line at right angles to surface.
Give one example of how refraction is useful in everyday life.
Eyeglasses, cameras, microscopes, lenses in projectors, etc.
What are the primary colours of light?
Red, Green, Blue.
What are galaxies made of?
Billions of stars, gas and dust held by gravity.
Name two other types of galaxy shapes.
Elliptical and irregular.
If the angle of incidence is 35°, what is the angle of reflection?
35°
What happens to the speed and direction of light when it passes from air into glass?
It slows down and bends toward the normal.
Which colour of light bends the most when passing through a prism?
Violet
What is the largest asteroid in the Solar System, also known as a dwarf planet?
Ceres, located in the asteroid belt between Mars and Jupiter.
What is the largest thing in the Universe?
The Universe itself!