Geometrical OpticsHard
Question
A plane convex lens of refractive index 1.5 and radius of curvature 30 cm is silvered at the curved surface. Now this lens has been used to form the image of an object. At what distance from this lens an object be placed in order to have a real image of the size of the object?
Options
A.20 cm
B.30 cm
C.60 cm
D.80 cm
Solution
and
and fm = 15 cm.
∴ F = 10 cm.
Object should be placed at 20 cm from the lens.
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