Question

a) A concave lens of focal length 15 cm forms an image 10 cm from the lens. How far is the object place
from the lens? Draw the Ray Diagram.
3
b) A doctor has prescribed a corrective lens of power +1.5 D. Find the focal length of the lens. Is theprescribed lens diverging or converging?​

Answer 1

Answer:

1/v = -3/5 is far of the object

Answer 2

Hey You ❤

Your Answer :--

Given :

Focal length of concave lens, f = - 15 cm

Image distance, v= - 10 cm

Lens Formula :

According to the lens formula,

1/v - 1/u = 1/f

1/u = 1/v - 1/f

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

1/u = -1/10 + 1/15 = -5/150

u = - 30 cm

The negative value of u indicates that the object is placed 30 cm in front of the lens.

Note : For Ray Diagram please see attached file :)

Glad To Help :D

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