Question

An equiconvex lens having $\mu =1.5$ and radius of curvature $10cm$ is cut into four equal parts as shown in the diagram.

Now two parts are used to form the image as shown in the diagram

Now considering $O$ as origin $(0,0)$, if $x$ and $y$ co-ordinate of image is $(ncm,mcm)$, then the value of $(n\times m)$ is

Answer 1

Answer: 8

Now lens $1$ and lens $2$ have $f=20cm$.

Now for lens $2$ , principal axis is $2mm$ above the given axis, so image is at focus point

$n=40cm;m=0.2cm$
so, $nm=8$