An object is located 4m from the first of two thin converging lenses of focal lengths 2m and 1m respectively. The lenses are separated by 3m. The final image formed by the second lens is located from the source at a distance of

Question:

Options :

(a) 8.0 m
(b) 7.5 m
(c) 6.0 m
(d) 6.5 m

Answer :

(b) 7.5 m

Answer Steps :

step 1

step 2

step 3

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Forty electric bulbs are connected in series across a 220 V supply. After one bulb is fused, the remaining 39 are connected again in series across the same supply. The illumination will be

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