Question

4
Find the sire Nature and position of the image formd
when an object of size 1 cm is placed at a distance 15 cm froma concave morror of focal length
10 cm​

Answer 1

Answer:

sorry

Explanation:

l don't understand question

Answer 2

Answer:30cm in front of the mirror

Explanation:In usual notations, with proper sign, we have

u=-15cm,f=-10cm and y1=+1cm

Substituting these values in the mirror formula 1/v+1/u=1/f

1/v=1/f-1/u

1/v=-(1/10)-(-(1/15)

1/v=-(1/10)+(1/15)

1/v=(2-3)/30

1/v=-1/30

v=-30cm

The image is formed at 30 cm infront of the mirror (because v is negative)

The magnification is m=-(v/u)=-(-30/-15)

m=-2

Since the magnification is negative, the image is real(inverted)

The size of the image is given by

y2=m×y1

y2=-2×(1 cm)=-2cm

(-)=image is inverted