Draw a diagram to locate the position of a convex lens kept between a candle and a screen separated by a distance of 90cm, so that an image of the candle, half the size of it, may be formed on the screen. Deduce the focal length from the diagram. Please answer this question soon as I have an exam tomorrow.
Dear Student,
Given magnification = m = -1/2 since it is real image obtained on the screen and half the size of the object.
m = v/u = -1/2
v = -u/2----(1)
Aiso given -u+v = 90cm ---(2)
So on solving equation (1) and (2) v = 30cm and u = -60cm
Regards
Given magnification = m = -1/2 since it is real image obtained on the screen and half the size of the object.
m = v/u = -1/2
v = -u/2----(1)
Aiso given -u+v = 90cm ---(2)
So on solving equation (1) and (2) v = 30cm and u = -60cm
Regards