Question

a point object is placed at a distance of 10 cm and its real image is formed at a dustance of 20 cm from a concabe mirror if the object is moved by 0.1 cm towards the mirror the image will shift about?​

Answer 1

Answer:

0.41237

Explanation:

u=-10cm, v=-20cm

since, 1/f=1/v+1/u

therefore, f=-20/3

Now, object is moved by 0.1cm towards mirror

u=-(10-0.1)=-9.9cm

f=-20/3cm

using 1/f=1/v+1/u

v=-20.412cm

therefore image will shift about (20.412-20)=0.412cm away from the mirror