Two plano convex lenses of focal lengths $f_{1}$ and $f_{2}$ set for minimising spherical aberration are kept apart by 2 cm. If the equivalent focal length of combination is 10 cm, the values of $f_{1}$ and $f_{2}$ are :

Question

Two plano convex lenses of focal lengths

f_{1}

and

f_{2}

set for minimising spherical aberration are kept apart by 2 cm. If the equivalent focal length of combination is 10 cm, the values of

f_{1}

and

f_{2}

are :

Toppr Admin · Accepted Answer

D-f2-x2212-f1-x21D2-f2-x2212-f1-2 -x21D2-f2-2-f1feq-f1f2f1-f2-x2212-d-f1f2f1-f2-x2212-2-10-f1-2-xD7-f1-2f1-102-f1-20f1-18cmf2-2-f1-20cm

Two plano convex lenses of focal lengths $f_{1}$ and $f_{2}$ set for minimising spherical aberration are kept apart by 2 cm. If the equivalent focal length of combination is 10 cm, the values of $f_{1}$ and $f_{2}$ are :
$18 c m, 16 c m$
$18 c m, 20 c m$
$20 c m, 22 c m$
$14 c m, 20 c m$