Question

Focal length of a concave mirror is 25cm mention the nature and position of image formed of the object kept at 20cm from the mirror find magnefication

Answer 1

Explanation:

f = - 25cm

then it will be negative because mirror is concave....

u= -20cm

(negative because object always be in the left side of mirror)

v=?

mirror formula

1/v +1/u=1/f

1/v+ 1/(-20)= 1/(-25)

1/v=1/(-25)+1/20

1/v= -4+5/100

1/v=1/100

v=100

magnification formula of mirror is

m= -v/u

We have u=-20

v=100

now put in the formula

m=-100/-20

m=+5

if the magnification is greater than 1 then it is (enlarge) and (real)

position of the object is between c and f

position of the image is beyond centre of curvature

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