+0  
 
-1
102
1
avatar+800 

a paleontologist uses a magnifying glass to look at a T-Rex skull. IF the lens has a focal length of 12 cm and she is holding it 9 cm away from the skull

a) Where is the image?

b) What is its magnification?

c) How large would the image of a 5 mm diameter crack in the skull be?

Julius  Jan 19, 2018
Sort: 

1+0 Answers

 #1
avatar+12227 
+1

Recall  that  1/f = 1/do + 1/di

So:

1/12 = 1/9 + 1/di

di = -36 cm    Which means it is a virtual image on the same side as the object 36 cm from the lens

 

B:  M= -di/do = - (-36)/9 = 4

 

C.  magnification is 4   so   4 x 5 mm = 20mm dia

ElectricPavlov  Jan 19, 2018

18 Online Users

avatar
avatar
avatar
We use cookies to personalise content and ads, to provide social media features and to analyse our traffic. We also share information about your use of our site with our social media, advertising and analytics partners.  See details