6.
Two equvaillent convex lens of focal length 10 cm in kept in contact. The net power of
combination of lens is :-
(A) O D
(B) - 20 D
(C) + 20 D
(D) + 10 D
Answers
Answered by
2
Answer:
D) + 10 D
Explanation:
take Care ur self from this dangerous situation
Answered by
1
Answer:
Correct option is
B
+20cm
Given,
f
1
=+10cm for convex lens
f
2
=−20cm for concave lens
The focal length of the combination is given by
f
1
=
f
2
1
+
f
2
1
f
1
=
+10cm
1
+
−20cm
1
=
20cm
1
f=+20cm
The correct option is B.
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