Question

An object was placed at 20 cm from the convex mirror of focal length of 0.3 m .Find the position nature and magnification.

Answer 1

Answer:

u=-20cm

f=0.3 m =30cm,it is a convex mirror so it's focal length is positive

v=?

m=?

Explanation:

using mirror formula,

1/u+1/v=1/f

1/-20+1v=1/30

1/v=1/30+1/20

l,. c. m of 30 & 20 is 60

sooo,

1/v=2+3/60

1/v=5/60

1/v=1/12

then,

v=12cm.

&

m=-v/u ( according to mirror formula of magnification)

m=-(12/-20)

m=3/5

m=0.6cm

as , we know it is convex mirror so it's nature is virtual and erect