A candle flame and a screen are 180 cm apart. A lens is placed between them. For

a certain position of the lens a twice magnified clear image is obtained on the

screen. The lens is now moved away from the candle through 30 cm. To obtain

another clear image on the screen, the distance through which the screen has to

be moved is _________ and the new magnification of the image is __________.

mahadevan shankar , 13 Years ago

Grade 10