Question

A convex lens form a real & inverted image of a niddle at a distance of 50cm of it. where us the niddle placed if the image is equal to the size of the object? show with the help of diagram.​

Answer 1

Answer:

4D

Explanation:

v=+50cm

m= -1

now,

m=v/u

therefore : u=v/m

= 50/-1

= -50

Here, v = 2f = 50cm

therefore, f = 50cm/2 =25cm

=0.25m

Power P = 1/f (m) = 1/0.25 = 100/25 m^-1 = 4 dioptre =4D

thus the needle is placed at 50cm from the convex lens of power 4D...

I hope so that I am helpful