If the two thin convex lenses each of focal length 8 cm are kept coaxially and separated by a distance 20 cm each other, then equivalent focal
length is
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Answers
Answer:
Answer-
( identity : (a-b)² = a²-2ab +b²)
= {(2x - 5y)}^{2}=(2x−5y)
2
= {(2x)}^{2} - 2(2x)(5y) + {(5y)}^{2}=(2x)
2
−2(2x)(5y)+(5y)
2
= 4 {x}^{2} - 20xy + 25 {y}^{2}=4x
2
−20xy+25y
2
Answer:
Equivalent focal length D =-20CM
Explanation:
TO FIND:
Equivalent focal length is
GIVEN:
The two thin convex lenses each of focal length 8 cm are kept coaxially .
Separated by a distance 20 cm each other.
Lens formula
v=0.04166
Equivalent focal length =
Equivalent focal length D =-20CM
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