(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

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).

2. Relevant equations

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

Magnification = -s'/s

f = R/2

3. 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

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Image formed by concave mirror; completed need someone to check

**Physics Forums | Science Articles, Homework Help, Discussion**