Question

pls answer these question

Answer 1

As we know the formula of mirror is 1/f = 1/v+ 1/u.

C =2f=-40cm

F=-20cm

Ho(height of object)=2cm.

U = -10cm .

V = ?

Hi(height of image)=?

1/f=1/v+1/u

(-1/20)=1/v+(-1/10)

-1/20+1/10=1/v

-1+2/20=1/v

1/20=1/v

V=20cm

Hi/Ho=-v/u

Hi/2=-(20/-10)

Hi=20/10*2

Hi=2*2

Hi=4cm.

Answer:

V=20cm

Hi=4cm