Two lenses of focal length -10cm 2 points and +50cm are kept in contact with each other. What will be resultant focal length and power of the combination?
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Explanation:Equivalent focal length,f
eq
=
f
1
+f
2
−d
f
1
f
2
8=
30−d
10×20
240−8d=200
8
40
=d
Distance between lenses, d=5cm
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