less than the critical angle

equal to the critical angle

greater than the critical angle

exactly half of the critical angle

light going from water to air

light going from glass to water

light going from diamond to water

light going from water to glass

$$n=\frac{1}{\sin c}$$   

$$n=\frac{\lambda_1}{\lambda_2}$$  

$$n=\frac{c_1}{c_2}$$  

$$n=\frac{real\ depth}{apparent\ depth}$$  

Direct Relationship

Inverse Relationship

No Correlation

Platonic Relationship

W

X

Y

Z

$$30\degree$$  

$$45\degree$$  

$$60\degree$$  

$$90\degree$$  

Periscope

Endoscope

Pinhole Camera

Fibre Optic Cable

Because prisms will not fog up like mirrors.

Because prisms reflect light better than mirrors.

Because prisms have a smaller critical angle that mirrors.

Because prisms have a greater refractive index than mirrors.

Because diamonds don't shine, they reflect.

Because diamonds shine dimly, not brightly.

Because diamonds only absorb light and never emit.

Because diamonds sparkle like fireworks.