In an astronomical telescope in normal adjustment a straight black line of length L is drawn on inside part of objective lens. The eye-piece forms a real image of this line. The length of this image is 1. The magnification of the telescope is

Question:

Options :

(a) L/l-1
(b) L+1/L-1
(c) L/l
(d) L/l+1

Answer :

Answer Steps :

step 1

step 2

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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

If a body is executing simple harmonic motion then

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