Question

If concave mirror produces a real image of magnification 'm and the focal length of the mirror is
than the object distance is
b) (m - 1)f/m c) (m-1) f
d) (m + 1) f/m​

Answer 1

Answer:

(m+1)f/m

Explanation:

For concave mirror, using sign convention,

magnification, m=

u

−v

(by definition)

Where, u and v are the distances of real object and real image.

Now, from the formula of concave mirror,

f

1

=

u

1

+

v

1

Or, −

f

1

=

−u

1

+

−mu

1

∴−

f

1

=−(

mu

m+1

)

∴u=(

m

m+1

)f.

Answer 2

Explanation:

This is so easy answer