The radii curvatures of both the surfaces of a lens are equal (R) and – McqOptions

MCQOPTIONS

1.	The radii curvatures of both the surfaces of a lens are equal (R) and its is made of a material of refractive index 1.5 Its focal length will be
A.	±R
B.	±2R
C.	±R/2
D.	Zero
Answer» B. ±2R

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