Question

(a) Define power of a lens and write its SI unit. Name the type of lens
whose power is negative.
(b)
A convex lens forms a real and inverted image of finite size at a
distance of 50 cm from it. Where is the object placed in front of the
lens ? Give all possible positions of the object stating reason in each
case.
(c) Draw labelled ray diagram for any one position of the object
mentioned in (b) above.​

Answer 1

Answer:

it is a degree of converges and degree of diverges

SI unit diopter

Answer 2

For convex lens,

h1/h2=-v/u

1=-v/u

u=-v

According to the question,

Using lens formula,

-1/50 -1/50=1/f

-2/50=1/f

f=-25