Question

Convex lens of power 4d and concave lens 3d equivalent power?

Answer 1

Answer:-

• Power of Convex lens=4d

$\\ \sf\longmapsto P_1=4D$

• Power if concave mirror=3d(-)

$\\ \sf\longmapsto P_2=-3D$

We know that

$\boxed{\sf P_{(Equivalent)}=P_1+P_2\dots}$

$\\ \sf\longmapsto P_{(Equivalent)}=4D+(-3D)$

$\\ \sf\longmapsto P_{(Equivalent)}=4D-3D$

$\\ {\pmb{\sf{\longmapsto P_{(Equivalent)}=1D}}}$