Rays of light in water that shine up to the water-air boundary at
angles of more than 48degrees to the normal are totally reflected.  No
rays beyond 48degrees refract outside.  How about the other way
around?  Is there an angle at which light rays in air meeting the air-
water boundary will reflect totally or will some light be refracted at
all angles.

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Clarification of Question by daisy001-ga on 07 Mar 2005 06:36 PST

Hey so you told me how to do it, but you could elaborate and tell me
what numbers to plug in and the answer?

What you're talking about is called 'total internal reflection' and
occurs and any angle greater than the 'critical angle'.  This happens
when going from one optical medium to annother when n1 > n2, where the
light goes from medium n1 to n2.  The critical angle can be calculated
by:

critical angle = arcsin(n2/n1)

if n2 > n1 there is no critical angle, and refraction always occurs.

see http://scienceworld.wolfram.com/physics/CriticalAngle.html

-namcaps