Question

an object is placed in a distance 30cm from a thin lens of power 4
dioptre discuss the nature of image formed by the lens​

Answer 1

Explanation:

P = 1/f

f = 1/p

= 1/4

f =+ 25 cm ( convex lens)

1/f = 1/v - 1/u

1/25 = 1/v - (-1/30)

1/v = 1/25 - 1/30

1/v = 1/150

v = 150 cm ( real image)

nature of the image :

real, inverted and enlarged image.

Answer 2

Explanation:

P = 1/f

f = 1/p = 1/4

f=+ 25 cm (convex lens)

1/f=1/v-1/u

1/25=1/v-(-1/30)

1/v=1/25-1/30

1/v = 1/150

v = 150 cm (real image)

nature of the image:

real, inverted and enlarged image.