Geometrical OpticsEasy
Question
A diminished image of an object is to be obtained on a screen 1.0 m from it. This can be achieved by placing
Options
A.a plane mirror
B.a convex mirror of suitable focal length
C.convex lens of focal length of length less than 0.25 m
D.a concave lens of suitable focal length
Solution
Image can be formed on the screen if it is real. Real image of reduced size can be formed by a concave mirror or a convex lens.
A diminished real image is formed by a convex lens when the object is placed byound 2 f and the image of such object is formed between f and 2 f on other side.
Thus, d > (2f + 2f)
or 4f < 0.1 m
or f < 0.25 m.
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