The critical angle in air for a particular type of glass is 39.0°. what is the speed of light in this class glass? (c = 3.00 × 108 m/s

Explanation:

As we know that the critical angle is the maximum angle for a given medium for which light ray will show the phenomenon of refraction into air

After critical angle the light will bend into the same medium and will show total internal refraction.

So here at critical angle the angle of refraction must be 90 degree into air

So here we know

now we know by the speed of light in medium is given as

two charges are fixed in place on the x-axis as shown. the charge at x = 0 is negative and has magnitude q = 2 μcoulombs (1 μcoulomb = 10-6 coulombs). the charge at x = d, (d = +12 cm), is positive and has magnitude q = 4 μcoulombs. find a point x = xo along the x-axis at which the electric field is zero.

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