Question

An object is placed in front of a concave mirror of radius of curvature 40cm at a distance of 10 cm What is u , R and f? It is positive or negative? Justify.​

Answer 1

Explanation:

the image is virtual and erect and behind the mirror and magnified

Answer 2

Answer:

I HOPE THIS HELPS YOU

Explanation:

R= –40 cm

F (Focal length) = –40/2

= –20 cm (According to sign convention)

U (object distance) = -10 cm (negative sign because it's a concave mirror)

according to mirror formula

1/f = 1/v+1/u

1/(-20) = 1/v + 1/(–10)

1/(–20)=1/v–1/10

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

-1+2/20 =1/v

1/20 =1/v

V=20 cm

so image distance is 20 cm