CBSE Class 10CBSE
Share
Notifications

View all notifications

At What Distance from a Concave Mirror of Focal Length 10 Cm Should an Object Be Placed So That: Its Real Image is Formed 20 Cm from the Mirror? - CBSE Class 10 - Science

Login
Create free account


      Forgot password?

Question

At what distance from a concave mirror of focal length 10 cm should an object be placed so that:  

its real image is formed 20 cm from the mirror?

Solution

Given 

It is a concave mirror. 

f=-10 cm 

v=-20 cm 

Since the image is real and forms in front of the mirror, the equation will be  `1/f=1/v+1/u` 

`1/-10=1/-20+1/u` 

`2/u=1/-10+1/20` 

`1/u=(-20+10)/200` 

`1/u = (-10)/200` 

`1/u=-1/20`

 u=-20 cm 

Therefore, the object should be placed at a distance of 20 cm from the mirror to form a real image. 

 

 

 

  Is there an error in this question or solution?

APPEARS IN

Solution At What Distance from a Concave Mirror of Focal Length 10 Cm Should an Object Be Placed So That: Its Real Image is Formed 20 Cm from the Mirror? Concept: Reflection of Light - Image Formation by Spherical Mirrors - Concave Mirror.
S
View in app×