A ….....is atransparent refracting medium bounded by three plane surfaces making a …...... (Fill the above blanks)

a PRISM is a transparent refracting medium bounded by three plane surfaces making a TRIANGLE .

A prism is made up of three plane surfaces of congruent rectangles which are arranged in a triangle...this is famous for distribution of sun light into 9 visible and non visible colours 

ULTRA VIOLET

VIOLET

INDIGO

BLUE

GREEN

YELLOW

ORANGE

RED

INFRA RED..