A B C D E F G H I J K L M N O P Q R S T U V W X Y Z


Density:
The mass of a substance per unit volume.
 
Diffraction:
The bending of light around the corners of an object.
 
Dioptre:
Unit of power of a lens.
 
Direct current:
An electrical current which always flows in one direction.
 
Dispersion:
The splitting of white light into its component colors.
 
Displacement:
The shortest distance between the initial and final position of a moving body. It is a vector quantity.
 
Distance:
The actual path length covered by a body. It is a scalar quantity.
 
Doppler Effect:
The apparent change in the frequency of a wave due to relative motion between the source and the observer.