Advertisement Remove all ads

How Far Should an Object Be Placed from the Pole of a Converging Mirror of Focal Length 20cm to Form a Real Image of the Size Exactly `1/4`Th the Size of the Object? - Science

How far should an object be placed from the pole of a converging mirror of focal length 20cm to form a real image of the size exactly `1/4`th the size of the object?

Advertisement Remove all ads

Solution

Given,
Focal length of the concave mirror (f) = 20 cm
Magnification (m) = -1/4
Using the magnification formula, we get  

`m=-v/u` 

`-1/4=(-v)/u` 

`v=u/4`  

Using the mirror formula, we ge

`1/f=1/v+1/u` 

`1/-20=4/u+1/u` 

`-1/20=5/u` 

u=100 cmThus, the object should be placed in front of the concave mirror at a distance of 100 cm

 

  Is there an error in this question or solution?
Advertisement Remove all ads

APPEARS IN

Lakhmir Singh Class 10 Physics (Science)
Chapter 4 Reflection of Light
Q 26 | Page 199
Advertisement Remove all ads

Video TutorialsVIEW ALL [1]

Advertisement Remove all ads
Share
Notifications

View all notifications


      Forgot password?
View in app×