Optics 3 Question 20
20. A hollow double concave lens is made of very thin transparent material. It can be filled with air or either of two liquids
(a) air and placed in air
(b) air and immersed in
(c)
(d)
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Answer:
Correct Answer: 20. (d)
Solution:
- The lens makers’ formula is
where,
In case of double concave lens,
For the lens to be diverging in nature, focal length
