Question

The plane faces of two identical plano-convex lenses each having a focal length of 50 cm are placed against each-other to form a usual convex lens. The distance from this lens combination at which an object must be placed to obtain a real, inverted image which has the same size as the object, is–

• A. 50 cm
• B. 25 cm
• C. 100 cm
• D. 40cm

Answer 1

$\frac { 1 } { + 50 }$

\ f = + 25 cm

To form real, inverted image of same size object must be at 2f = 50 cm