Question

An object is placed at a distance'f in
front of a convex mirror of focal
length 'f.Find the magnification
produced by it.​

Answer 1

A nswer:

1f =1v +1u  

1f=1v+1u

( Given u=−f2 )  

(u=-f2)

⇒1f =1v +(1f/2 )⇒1v =1f −1f  

⇒1f=1v+(1f/2)⇒1v=1f-1f

 ⇒1v =−1f  

⇒1v=-1f

and m=vu =ff/2 =2  

m=vu=ff/2=2

So virtual at the focus and of double size.

Hope it helps...

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