Question

Focal length of a concave mirror is 30 cm if an object is placed at 40cm give the option of image determined the magnification of the image also

Answer 1

Explanation:

focal length of a concave mirror=30=-30cm

f= -30

object distance (u)= -40cm

image distance(v)= ?

1/f=1/v+1/u

1/-30=1/v+1/-40

-1/30=1/v-1/40

-1/30+1/40=1/v

(-4+3)/120=1/v

-1/120=1/v

v=-120

the image distance=-120cm

magnification=-v/u=-120/-30=40

Answer 2

Explanation:

See the attachment.

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