Question

a convex lens of focal lenght is f forms an image which is 1/n times the object .the distance of object from mirror is
1) (n-1)f
2) (n+1)f
3) (n-1/n)f
4) (n+1/n)
give answer with explanation​

Answer 1

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Explanation: A convex mirror of focal length f forms an image which is 1 by N times the object the distance of the object from the mirror is

A convex mirror of focal length f produced an image (1/n)th of the size of the object. The distance of the object from the mirror is. solving, we get x=(n-1)f

Answer 2

Answer:

u=(n+1)f

Explanation:

magnification m= -v/u=1/n

-vn=u

v=-u/n

using lens formula

1/v-1/u=1/f

-n/u-1/u=1/f

-(n/u+1/u)=1/f

-(n+1/u)=1/f

-(n+1)f=u

therefore;u=-(n+1)f

here sign convention is not taken

so answer is (n+1)f

hope it's helpyou