Question

Solve the problem class 10 science

Answer 1

Linear magnification is given by the formula :

M = v / u

Case 1 :

Magnification ( M ) = 1 / 2

Image distance ( v ) = ?

Object distance ( u ) = 60 cm

M = v / u

==> 1 / 2 = v / 60 cm

==> v = 60 cm / 2

==> v = 30 cm

Case 2 :

From case 1 :

v = 30 cm

M = 1 / 3

v / u = M

==> 30 cm / u = 1 / 3

==> u = 30 cm × 3

==> u = 90 cm

The object should be placed 90 cm in front of the lens .

Hope it helps !

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