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Geometrical Optics question

2013 · Shift 0 · Q48

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JEE Main
Physics
Geometrical Optics
2013 · Shift 0 · Q48

Geometrical Optics question

2013 · Shift 0 · Q48

JEE MainPhysicsGeometrical OpticsMCQ+4 / −1

Diameter of a plano-convex lens is

6cm

and thickness at the center is

3mm

. If speed of light in material of lens is

2 \times {10^8}\,m/s,

the focal length of the lens is

A
$15cm$
B
$20cm$
C
$30cm$
D
$10cm$

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