Question

A person cannot see objects clearly which are
placed before 40 cm from him, the power of the
lens to correct the vision is
A
+2.5 D
B
+1.5 D
C
+6.6 D
D
+3D​

Answer 1

That lens should be given to the person which forms the image of an object at infinity at distance 40 cm in front of the eye.

Hence, u=−∞ and v=−40cm

Now,

f1=v1−u1

⟹f1=40−1−−∞1

⟹f=−40cm

P=f(cm)100=40−100=

⟹P=−2.5D

hope it will be useful

please follow me and mark mi as brainleast

Answer 2

Answer:

+2.5 D

Step-by-step explanation:

Because this lens is not either more or not either less so u can see with this number of lens from placed before 40cm from him

Please mark my answer brainlist answers