Question

an object of height 2 CM is placed at 20 cm distance in front of a concave mirror whose focal length is 15 cm calculate height of the image ​

Answer 1

Answer:

-6cm

Step-by-step explanation:

as we know that mirror formula =1/v+1/u=1/f

1/v+1/-20=-1/15

1/v=-1/15+1/20

1/v=-4+3/60

1/v=-1/60

v=-60cm

magnification for mirrors=-image distance/object distance

m=-v/u

m=-v/(-20)

m=-(-60)/-20

m=60/-20

m=-3

we know another formula for magnification=height of image/height of object

m=h2/h1

-3=h2/2

h2=-3×2

h2=-6cm