Question

An object is placed at a distance of 10cm in front of a concave lens of focal length 10cm 1) find the position of the image 2) the size of the image in relation to the object. 3) in what unit is the power of lens a expressed?​

Answer 1

Answer:

1) 5cm on the left side of the lens

2) Diminished

3) Dioptre (D)

Explanation:

Assuming the object to be placed on the left side of the lens,

f= -10cm for a concave lens.

u= -10cm ( distance from the pole to the object is opposite to the direction of light.)

v=?

1/f=1/v - 1/u (Lens formula)

Substitute with proper signs and solve for v.

We get v= -5cm which means it is on the left side of the lens.

Answer 2

I hope this helps you out...