42.
reciprocal of the intercept in either axis.
A real image of an object formed by a converging lens of focal length 15cm is
three times the size of the object. What is the distance of the object from
the lens?
43.
44.
Ans: 20cm
25
WAEC 199228
A converging lens of focal length 15cm is used to obtain a real image magnified
1½ times. Calculate the distance of the image from the lens. WAEC 199722 Ans:37.5cm
The real image of an object, formed by a converging lens of focal length 15cm, is
three times the size of the object. Calculate the object distance. WAEC 199925 Ans: 20cm
45.
An object is placed 20cm from a lens. If an image is formed on a screen 260cm
away from the lens, calculate the magnification of the image.
WAEC 2001 Ans:13
A converging lens of focal length 15cm forms a virtual image at a point 10cm
om the lens. Calculate the distance of the object from the lens. WAEC 200229 Ans:6cm
A converging lens produces an image four times as large as an object placed 25cm
m the lens. Calculate its focal length.
WAEC 20033 Ans: 20cm
A converging lens forms a real image of a real object. If the magnification is 2
the distance between the image and the object is 90.0cm, determine the
6.
i)
focal length of the lens;
ii)
object distance for which the image would be the same size as the object.
WAEC 2006E13 Ans: (i) 20cm (ii) 40cm
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