Question

concave lens has a focal length 10 cm and object 2.5 cm height is placed at 30 cm from the lens determine the size and the position of the image​

Answer 1

• Size and the position of the image is 0.625 and -7.5 cm respectively.

Given-

Focal length of the concave lens is negative so f = -10 cm

Object distance from the lens is u = -30 cm

As, we know that

1/f = 1/v - 1/u where f is the focal length, v is the image distance from the lens and u is the object distance from the lens.

By putting the values in the above formula we get -

v = - 7.5 cm

And we know that magnification is equals to height of the image to the height of the object.

So, m = v/u = H1/H0

By putting the values we get -

H1/2.5 = -7.5/ -30

H1= 0.625

Answer 2

Answer:

the answer is 0.625 and 7.5

hope this helped you