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## Homework Statement

The critical angle of a certain plastic in air is 37.3 degrees. Wats the critical angle of the same plastic if its immersed in water?

## Homework Equations

n1sin( theta)= n2sin(theta)

## The Attempt at a Solution

Nair= 1.00

1.00sin37.3/1.33 = sin(theta)

sin(theta)= .455

inverse sin (theta) = 27.1 degrees

Is that right?