what is the focus distance of combined lens made by combining concave lens of 20cm focus distance placed in contact with a convexlens of 30cm focus distance ? whether this combination is convergent lens or divergent lens ?
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Explanation:
Focal length of convex lenses, f1=30cm
Focal length of concave lenses, f2=−20cm
⇒f1=f11+f21
f=−60cm. Therefore diverging lens .
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