Question

TP Times Hint Magnification formulo and mirror formula
An objectes placed 3m away from a lens which forms its image at a distance of 1m on the same side of the
Tens where the object is placed. Find the power of the lens. What type of the lens used?
barues that it forms an erect imapen size three times the​

Answer 1

u= - 3 m

v = -1m

f=?

NOW

Using lens formula,

1/v -1/u =1/f

= -1/1 - (1/-3) = 1/f

= -1+1/3 =1/f

= -2/3 =1/f

= -3/2 = f

=f= -3/2 m

hence the focal length is -3/2 m

NOW

POWER =1/F

=P = 1/-3/2

=P = -2/3 D

HERE ,CONCAVE LENS IS USED.