# Lab 8 prep

## Lab 8 prep

anyone know how to do #3 and #4?

guest_01
Guest

## #3

the shorter distance is 6 cm
the longer distance is 25 cm

I guessed the shorter distance since the object and image are 30 cm apart from each other, i used 30 cm as "i" and 5 for f. then solved for o and got 6. For the longer distance, I just plugged in values of o and i that would add up to 30 and picked the set that gave the closest answer to .2 (1/5=.2 for focal length) and that happened to be 25.

guestttt
Guest

## question 4

anyone know how to do question 4?

sck105
Guest

## Question 4

Deltao = ((Deltao)/o)*(1/o)
Deltai = ((Deltai)/i)*(1/i)

if anyone has the last part it would be greatly appreciated! thanks

woo
Guest

## Question 4

For the last part of Q4:

sqrt(((((Deltao)/o)*(1/o))^2)+((((Deltai)/i)*(1/i))^2))

guestttt
Guest

## errors

anyone know how to find the error in f for on the excel sheet? I tried using the equation from the lab prep but it doesnt work. Also, how do you find error in magnification? thanks =]

kt
Guest

## errors for maginfication

sqrt((Deltah_i/h_i)^2+(Deltah_o/h_o)^2)* mag of(h_i/h_o)

its the same thing for both errors of magnification

physhelp
Guest

## errors

what i mean is the same method for both

physhelp
Guest