- #1

- 47

- 0

## Homework Statement

A person accidentally bit his tongue and wants to examine the bite by using a concave mirror. The mirror is placed 10 cm from the bite with the result that a virtual image of the bite appears 4 times actual size. Find the parameters s (distance from object to mirror), s' (distance from mirror to image), and R (radius of convex mirror).

## Homework Equations

1/s + 1/s' = 1/f ; f=focal length

Magnification = -s'/s

f = R/2

## The Attempt at a Solution

i got s = 10 cm

then using magnification formula (4 = -s'/s)

i got s' = -40 cm (negative b/c its a virtual image)

i then got focal length = 13.3333 using formula 1

so if f=R/2; R = 26.6667 cm

any input would be appreciated