If 1 and 2 represent mediums, 'n' is refractive index and 'R' is radius of curvature, then the lens maker’s formula is written as __________.

1 / f = (n21 - 1)(1 / R1 + 1 / R2)

1 / f = (n21 - 1)(1 / R1 - 1 / R2)

If 1 and 2 represent mediums, 'n' is refractive index and 'R' is radiu

1.	If 1 and 2 represent mediums, 'n' is refractive index and 'R' is radius of curvature, then the lens maker’s formula is written as __________.
A.	f = (n21 - 1)(1 / R1 - 1 / R2)
B.	1 / f = (n21 - 1)(1 / R1 + 1 / R2)
C.	f = (n21 + 1)(1 / R1 - 1 / R2)
D.	1 / f = (n21 - 1)(1 / R1 - 1 / R2)
Answer» E.

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If 1 and 2 represent mediums, 'n' is refractive index and 'R' is radius of curvature, then the lens maker’s formula is written as __________.

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