When a convex lens of focal length 30 cm is in contact with concave lens of focal length 20 cm find out if the system is?
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Answered by
11
F1=+30cm (Convex lens)
F2=-20cm (concave lens)
F=focal length of combination
1/f=1/f1 +1/f2
F=f1 f2/f2+f1
=30*(-20)/-20+30
-600/10=-60 cm
The system behaves as a diverging
lens
Answered by
5
Answer:
f 1 = + 30 cm (Convex lens)
f 2 = - 20 cm (Concave lens)
f = focal length of combination
1/f = 1/f 1 + 1/f 2
f = (f 1 * f 2)/(f 2+f 1 )
= 30 * (-20) / -20+30
= -600/10 = -60 cm
The system behaves as a concave lens
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