Consider an underwater spherical air bubble (you can assume the index of refraction of air is 1 and water is 1.33) with radius R. This bubble can act as a lens. What is its focal length?

-2R

Explanation:

The focal length can be calculated using this formula

1/f = (n1/n2-1)(1/r1-1/r2)

1/f = (1/1.33-1)(1/r + 1/r)

= -0.133/1.33(2/R)

F = -2R

The focal length is this

the answer is d. 4

hope this

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because it says use -2,0,and 2 for x, we can plug those numbers into the equation. y/4=3/4(-2)+2   y/4= -1 1/2 +2 now to get x by itself, we can multiply each side by 4. y=-6+8 which equals y=2 when x=-2. now you can do the same thing with 0 and 2 as x. you get y=8 when x=0 and y=14 when x=2.

x   |   y

-2 |   2

0   |   8

2   |   14