JEE MAIN - Physics (2019 - 9th April Evening Slot - No. 20)
A convex lens of focal length 20 cm produces
images of the same magnification 2 when an
object is kept at two distances x1 and x2
(x1 > x2) from the lens. The ratio of x1 and x2
is :-
3 : 1
2 : 1
5 : 3
4 : 3
Explanation
Magnification is 2
If image is real, $${x_1} = {{3f} \over 2}$$
If image is virtual, $${x_2} = {f \over 2}$$
$${{{x_1}} \over {{x_2}}} = 3:1$$
If image is real, $${x_1} = {{3f} \over 2}$$
If image is virtual, $${x_2} = {f \over 2}$$
$${{{x_1}} \over {{x_2}}} = 3:1$$
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