Question

0.5 CM tall object is placed perpendicular to the principal axis of a convex lens of focal length 20cm the distance of the object from the lens is 20 cm find the position size and nature of image formed​

Answer 1

Answer:

Image is formed infinity.highly enlarged.real and inverted

Answer 2

Answer:

v = infinity

The image will be larger.

The image will be real and inverted.

Explanation:

Given:

Focal Length, f = + 20 cm

Obj dist, u = - 20 cm

Obj Size, ho = + 0.5 cm

To find:

Img dist, v = ?

Img size, hi = ?

Other Vars needed:

Magnification, let m.

Solution:

Using lens formula,

1/f = 1/v - 1/u

1/20 = 1/v - 1/-20 = 1/v + 1/20

1/v = 1/20 - 1/20 = 1/0

or, v = infinity

m = -v/u = -∞/20 = -∞

Therefore, the image will be larger.

Since m is -, the image will be real and inverted.