Question

An objectis placed at 40cm distance,infront of converging mirror of focal length 20cm . find the image position and write its characteristic

Answer 1

The object is placed at 40cm away from the converging mirror ( Concave mirror ) of Focal length 20 cm .

Radius of curvature = 2F=2*20=40cm .

Hence ,The object is placed at Centre of curvatute .

We know that ,For a object placed at Centre of curvature ,The image is formed at the centre of curvature and of same size .As the mirror is concave ,The image is Real .

Characteristics of image formed :- Real ,inverted ,Same size and At the C( centre of curvature .)

Answer 2

object distance= -40cm concave mirror
focal length= -20cm
by using mirror formula,
1/f= -1/v-1/u
1/-20= -1/v+1/40
1/-20+1/40= -1/v
-1/40= -1/v
v=40cm
virtual and erract