State the principle of a pinhole camera.
Why can you not see lighted candle through a bent pipe?
Is the shadow or the image of an object, in a plane mirror, always of the size as the object?
Name two artificial sources of light.
Name two natural sources of light.
Unscramble WDAHOS to form a word or term.
Unscramble QOPUAE to form a word or term.
Unscramble TILHG to form a word or term.
