Question

A concave lens has focal length of 25cm. At what distance should the object from the lens be placed so that it forms an image at 10cm distance from the lens?Also find the magnification produced by the lens.

Answer 1

Answer:

$\red{ANSWER}$

f = -25 cm , v = -10 cm , u = ? , m = ?

1/v - 1/u = 1/f

1/v - 1/f = 1/u

1/u = 1/-10 - 1/-25

= 1/-10 + 1/25

= -5 + 2/50

1/u = -3/50

u = 50/-3

u = - 16.6 cm

m = v/u

m = -10/-16.6

m = 0.602

$\green{THANK YOU}$

Answer 2

Explanation:

f = -25 cm , v = -10 cm , u = ? , m = ?

1/v - 1/u = 1/f

1/v - 1/f = 1/u

1/u = 1/-10 - 1/-25

= 1/-10 + 1/25

= -5 + 2/50

1/u = -3/50

u = 50/-3

u = - 16.6 cm

m = v/u

m = -10/-16.6

m = 0.602