Question

Object distance and image distance of a lens are -60 cm and -20 cm respectively,
then the magnification of lens will be
A -0.33
B + 3.0
C. + 0.33
D. + 4.0​

Answer 1

Answer:-

C. +0.33

Explanation:

u= -60 cm

v= 20 cm

Mafnification Formula :- M=v/u

M= -20cm/-60cm

M= 1/3

M=0.33

So, the correcet answer is option C +0.33..

Answer 2

Given:

Object distance and image distance of a lens are -60 cm and -20 cm.

To find:

Magnification of lens?

Calculation:

Magnification of lens can be calculated from the ratio of the image distance and the object distance.

• Let magnification be M.

$M = \dfrac{ image \: distance}{object \: distance}$

$\implies M = \dfrac{ - 20}{ - 60}$

$\implies M = \dfrac{1}{3}$

$\implies M = + 0.33$

So, magnification is +0.33.

• This means that the image is virtual, erect and diminished.