A concave lens and convex lens have same focal length of 16 cm each. They both are kept in contact. This combination is used to view an object 3.5 cm long, the image of this object is
Magnified
Not visible
Diminished
Same size
A
Diminished
B
Same size
C
Not visible
D
Magnified
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Solution
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The focal..length of convex lens is positive and concave lens negative, hence, combination 1f=1f1+1f2 Given, f1=f2 1f=1f1−1f2=0 f=∞ The combination has infinite focal length. Hence, image of object is of same size.
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