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Magnification by Thin Lenses

A double conv...

Question

A double convex glass lens of focal length f and having a circular aperture is cut into halves, each having a semicircular aperture. The focal length of each half is ______.

A

f

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B

2 f

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C

\frac{f}{2}

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D

Infinity

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Solution

The correct option is A $f$
When the double convex lens is cut parallel to the principle axis, then the focal length of the two half lenses thus formed remains the same as that of original full lens i.e. $f$ .

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