Question

If the overall magnification of a series of two lenses is 30x, and one lens magnifies 5x, what is the magnification of the other lens? Calculate the total magnification if the 5x lens is replaced by a 7x lens

Answer 1

Answer:

Explanation:

Given

Overall magnification $M=30 x$

One lens magnification is $5 x$

suppose the magnification of other lens is $y$

A compound lens is made up of series of lenses either  of same or of different magnification so

$y$ is given by

$y=\frac{30 x}{5 x}=6 x$

If $5 x$ lens is replaced by $7 x$ lens then total magnification is

$7 x\times 6 x=42 x$