Question

Two identical symmetric double convex lenses of focal length \(f\) are cut into two equal parts \(L_1, L_2\) by \(AB\) plane and \(L_3, L_4\) by \(XY\) plane as shown in figure respectively. The ratio of focal lengths of lenses \(L_1\) and \(L_3\) is graphics[width=0.5\linewidth]{Q10.png}

• A. \(1:4\)
• B. \(1:1\)
• C. \(2:1\)
• D. \(1:2\)

Hint:

Cutting a lens changes: \[ \mathrm{Aperture} \] but focal length remains unchanged if radii of curvature remain same.

Answer 1

The Correct Option is B