The power of a lens is +5 diopters. What is the nature and focal length of
this lens ? At what distance from this lens should an object be placed so
as to get its inverted image of the same size
Answers
the lens is a convex lens since power is '+' 5.
focal length (f) = 1/power.
the power of lens is reciprocal of focal length taken in metre.
so, 1/5 = 0.2 m
which is equal to 20 cm.
Inverted image of same size will be obtained when object is placed at 2F,
which is double of focal length.
so, 20*2 = 40 cm.
object must be placed 40cm from lens to obtain an inverted image of same size.
Answer:
Explanation:
the lens is a convex lens since power is '+' 5.
focal length (f) = 1/power.
the power of lens is reciprocal of focal length taken in metre.
so, 1/5 = 0.2 m
which is equal to 20 cm.
Inverted image of same size will be obtained when object is placed at 2F,
which is double of focal length.
so, 20*2 = 40 cm.
object must be placed 40cm from lens to obtain an inverted image of same size.