A convex lens forms a real image of an object for its two different positions on the screen. If height of the images in two cases are 8 cm and 2 cm, then the height of the object will be :

Question

A convex lens forms a real image of an object for its two different positions on the screen. If height of the images in two cases are 8 cm and 2 cm, then the height of the object will be : (A) 2 cm (B) 4 cm (C) 8 cm (D) 16 cm

Tardigrade Admin · Accepted Answer

Taking the displacement method into consideration, we have Height of object d=√d1d2= 8× 2 =√8× 2 = 4 cm

Q. A convex lens forms a real image of an object for its two different positions on the screen. If height of the images in two cases are $8 c m$ and $2 c m$ , then the height of the object will be :

2 cm

4 cm

8 cm

16 cm

Taking the displacement method into consideration,
we have Height of object $d = d_{1} d_{2} = 8 \times 2$ $= 8 \times 2$
$= 4 c m$

Q. A convex lens forms a real image of an object for its two different positions on the screen. If height of the images in two cases are 8cm and 2cm, then the height of the object will be :