CGPET 2013 Solved Paper

Section: Physics

Question : 20 of 150

Marks: +1, -0

The correct formula used to decide the focal length of a lens is (F is focal length, µ is refractive index of the material of lens, R1 and R2 are radii of curvature of curved surfaces; u and v are respectively object distance and image distance

‌
1
F
=‌
1
v
−‌
1
u
‌
1
F
=(µ−1)(‌
1
R1
−‌
1
R2
)
‌
1
F
=‌
1
v
+‌
1
u
‌
1
F
=(µ−1)(‌
1
R1
+‌
1
R2
)

Validate

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