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Class 12 NEET Physics Optics Questions Part 2
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Question : 13
Total: 50
Two thin lenses are of same focal lengths (f), but one is convex and the other one is concave. When they are placed in contact with each other, the equivalent focal length of the combination will be
[NEET 2023]
f
4
f
2
Infinite
Zero
Validate
Solution:
👈: Video Solution
Convex lens
f
1
>
0
, concave lens
f
2
<
0
1
f
eq
=
1
f
1
+
1
f
2
=
1
f
−
1
f
=
0
f
eq
=
∞
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