Question

a dentist uses a small concave mirror of focal length 3.0 CM and holds it at a distance of 2 cm from tooth what is the magnification of image..

fast guys

Answer 1

Heya!!

Since it is a concave mirror,

So u( distance of object from mirror) = -2cm,
Focal length (f) = -3cm

Since 1/f = 1/u + 1/v

=) 1/-3 = 1/-2 + 1/v

=) - 1/3 + 1/2 = 1/v

=) 1/6 = 1/v

=) v (distance of image from mirror) = 6cm

Since magnification = - v/u

= - 6/-2

= 3

Hope it helps uh!!

Answer 2

★Hello mate here is your answer...

1/f= 1/u+1/v»1/v=1/f - 1/u

» 1/v = 1/-3- 1/-2= 1/6

Magnification, m= Image distance/ object distance,

= - 6cm/-2cm

= 3 cm

★Hope this will help you«««