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UPSEE 2019 Solved Paper
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© examsnet.com
Question : 43
Total: 150
An achromatic combination of lens is formed by joining
two convex lenses
two concave lenses
one convex lens and one concave lens
one convex lens and one plane mirror
Validate
Solution:
For an achromatic combination of lenses, there should be
ω
1
f
1
+
ω
2
f
2
=
0
⇒
ω
1
f
1
=
−
ω
2
f
2
Here, one focal length is positive and another one is negative i.e., one lens is convex and another is concave lens.
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