The magnification of an image by a convex lens is positive only when the object is placed

Question

The magnification of an image by a convex lens is positive only when the object is placed (A) At its focus F (B) Between F and 2F (C) At 2F (D) Between F and optical centre

Tardigrade Admin · Accepted Answer

The magnification of an image by the convex lens is positive only when the object is placed between focal point

(F)

and optical centre because image formed by the convex lens for this location of the object is virtual and magnified and for real image

m = - v e

For virtual image,

m = + v e

Q. The magnification of an image by a convex lens is positive only when the object is placed

At its focus $F$

Between $F$ and $2 F$

At $2 F$

Between $F$ and optical centre

The magnification of an image by the convex lens is positive only when the object is placed between focal point $(F)$ and optical centre because image formed by the convex lens for this location of the object is virtual and magnified and for real image $m = - v e$
For virtual image, $m = + v e$

Q. The magnification of an image by a convex lens is positive only when the object is placed

At its focus F

Between F and 2F

At 2F

Between F and optical centre

The magnification of an image by the convex lens is positive only when the object is placed between focal point (F) and optical centre because image formed by the convex lens for this location of the object is virtual and magnified and for real image m=−ve For virtual image, m=+ve

At its focus $F$

Between $F$ and $2 F$

At $2 F$

Between $F$ and optical centre

The magnification of an image by the convex lens is positive only when the object is placed between focal point $(F)$ and optical centre because image formed by the convex lens for this location of the object is virtual and magnified and for real image $m = - v e$
For virtual image, $m = + v e$