Question

Choose the correct relation between u,v,r
(A) R=2uv/u+v
(B) R=2/u+v
(C) R=2(u+v)/(uv)
(D) none of these

Answer 1

Answer:

Explanation:

For a spherical mirror,

u is distance of object from pole,

v is distance of image from pole.

f is focal length of mirror.

From mirror formula

v

1

​  

+  

u

1

​  

=  

f

1

​  

 

uv

u+v

​  

=  

f

1

​  

 

So, f=  

u+v

uv

​  

 

and since  r=2f=  2uv /u+v

​  

Answer 2

Explanation:

Choose the correct relation between u,v,r

(A) R=2uv/u+v

(B) R=2/u+v

(C) R=2(u+v)/(uv)

(D) none of these