Question

An object is placed at distance of 8 cm from concave mirror of focal length 10 cm. Find position and size of the image

Answer 1

Answer:

Explanation:

given that , u= (-8)cm

f= (-10)cm

and by mirror formula ,

1/f=1/v+1/u

= 1/(-10)=1/v+(1/(-8))

=  -1/10=1/v -1/8

= -1/10+1/8= 1/v

= ((-4 )+ 5)/40=1/v

= 1/40=1/v

= v=40 cm

so image is at 40 cm behind mirror, it is virtual erect and enlarged.

Answer 2

Answer:

u= -8cm

f= -10 cm

v=?

m=?

mirror formula =1/v+1/u=1/f

=-1/10+1/8=1/v

=v=-1.1 m

magnification=-v/u

=-(-1.1)/-8

=0.13

Explanation: