Question bank/JEE Main/Physics

A convex lens is placed between a fixed object and a fixed
screen. The distance between the object and the screen is 150 cm. The
real images of the object are formed on the screen for two successive
positions of the lens separated by a distance of 50 cm. The focal length
of the lens is

A25 cmB33.3 cmC45 cmD66.6 cm

Show answer and solution▾

B
According to displacement method
[IMAGE] = 33.3 cm
∴ (B)

Source: Grass-G / P-02 Physics Paper-02_Update.docx