Question

if an object of 10 cm in height is placed at a distance of 36 cm from a concave mirror of focal length 12 centimetre find the position nature and height of the image​

Answer 1

Answer:

h=10cm

u=-36cm

f=-12cm

v=?

h'=?

so using mirror formula

Explanation:

1/u+1/v=1/f

1/-36+1/v=1/-12

1/v=1/-12+(1/-36)

l. c. m of 12 and 36 is36

1/v=-3-1/36

1/v=-4/36

1/v=-1/9

then,

v=-9cm

as we know,

m= -v/u & m = h'/h

m=-(-9/-36) & m = h'/ 10

m = - 1/4 & m=h'/10

so we compare the m

then,

-1/4 =h'/10

h'=-10/4

h'= -5/2

h'=-2.5cm

the image is real & inverted because it is a concave mirror