Problem VII

An object is placed $25$ cm from a mirror. The resulting image has a magnification of $+2\mathrm{.}0.$

$17.$ Find the image distance from the mirror. $(2$ points$)$

$($a$)+50$ cm $.$

$($b$)-50$ cm $.$

$($c$)+40$ cm $.$

$($d$)-40$ cm $.$

$($e$)+20$ cm $.$

$($f$)-20$ cm $.$

$($g$)+10$ cm $.$

$($h$)-10$ cm $.$

$($i$)-.$

$($j$)$ none of the above.

$18.$ Find the focal length of the mirror.

$(2$ points$)$

$($a$)+50$ cm $.$

$($b$)-50$ cm $.$

$($c$)+40$ cm $.$

$($d$)-40$ cm $.$

$($e$)+20$ cm $.$

$($f$)-20$ cm $.$

$($g$)+10$ cm $.$

$($h$)-10$ cm $.$

$($i$)-.$

$($j$)$ none of the above.

$19.$ What is the shape of the mirror?

$(1$ point$)$

$($a$)$ concave.

$($b$)$ convex.

$($c$)$ flat.

$($d$)$ none of the above.

$20.$ Which of the following ray diagrams best represents this image formation $($not to scale and mirror shape not shown$)?$

$(2$ point$)$

$($a$)$

$($b$)$

$($c$)$

$($d$)$

Plewse answer all, thank you