Q21. A screen is placed at a distance 40cm away from an illuminated object. A converging lens is placed between the source and the screen and it is attempted to form the image of the source on the screen. If no position could be found, the focal length of the lens:Physics — Optics, Nature of Light and Optical Instruments — Question 21 of 155A. Must be less than 10cmB. Must be greater than 10cmC. Must not be greater than 20cmD. Must not be less than 10cm.Practice more Physics MCQs for entrance exam preparation on Examora.io.← Previous Question Next Question →