Question

4 upon three times magnified erect image is obtained by a concave mirror of focal length 10cm where should object be placed to get this image also find the distance of the image formed

Answer 1

Answer:V = 40cm

Explanation:

From mirror formula,

1/f= 1/v+1/u

but M=v/u

where M=3, f =10cm

3 = v/u,

v=3u......(I)

1/10= 1/v+ 1/u .......ii

substitute equation i into ii

u = (40/3)cm

from equation i ,

V= 3u cm

V = 3× 40/3 cm = 40cm