Question

with the uses of mirrors formula find :u,when v=20 cm and f=5cm in concave mirror​

Answer 1

Focal length ,F = ?

object distance is = -20cm

Magnification ,1.5=

−20

−V

V=30cm

using the mirror formula

V

1

+

u

1

=

F

1

30

1

−

20

1

=

F

1

60

2−3

=

F

1

=F=−60cm