Two thin lenses have a combined power of +9D. When they are separated distance of 20 cm, then their equivalent power becomes +27/5 D. Their individual power (in dioptre) is respectively:

Question:

Options :

(a) 2,7
(b) 4,5
(c) 1,8
(d) 3,6

Answer :

(d) 3,6

Answer Steps :

step1

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An alternating voltage source is connected in series with a resistance R and an inductance L. If the potential drop across the resistance is 200 V and across the inductance is 150 V, then the applied voltage is:

In an a. c. circuit the instantaneous current and e.m.f. are represented as: I = I0 sin(ωt – π/6) and E = E0 sin(ωt + π /3) respectively. The voltage leads the current by

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