A diverging meniscus lens of radii of curvatures 25cm and 50cm has a refractive index 1.5. Its focal length length is

A diverging meniscus lens of radii of curvatures 25cm and 50cm has a r

1.	A diverging meniscus lens of radii of curvatures 25cm and 50cm has a refractive index 1.5. Its focal length length is
Answer» `-50` `-100` 100 50 Answer :B