The focal length of a convex lens is 20 cm and a convex lens is 30 cm. If they form aromatic doublet what is its effective focal length
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Answered by
1
ANSWER
Focal length of convex lenses, f
1
=30cm
Focal length of concave lenses, f
2
=−20cm
⇒
f
1
=
f
1
1
+
f
2
1
f=−60cm. Therefore diverging lens .
Answered by
1
Answer:
he focal length of a convex lens is 20 cm and a convex lens is 30 cm
effective focal length = -60cm
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