Two identical glass (ng = 3/2) equiconvex lenses of focal length f each are kept in contact. The space between that two lenses filled with water (n = 4/3). The focal length of the combination

Question:

Options :

(a) 3f/4
(b) f/3
(c) f
(d) 4f/3

Answer :

(a) 3f/4

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

If a body is executing simple harmonic motion then

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