Geometrical OpticsMedium
Question
In a concave lens, a ray of light emanating from the object parallel to the principal axis of the lens after refraction:
Options
A.passes through $2F$, which is the radius of curvature of the lens.
B.appears to diverge from the first principal focus.
C.emerges parallel to the principal axis.
D.passes through the second principal focus.
Solution
Sol. [Key Concept: Concave lens — ray parallel to axis appears to diverge from focus] 
$F_{2}$ is the second principal focus ⇒ It is the virtual image position for object at infinity.
$F_{1}$ is the first principal focus ⇒ It is the virtual object position for which image is formed at infinity.
The best appropriate answer is option (2), although it should be second principal focus.
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