A thin equiconvex lens is made of glass of refractive index 1.5 and its focal length is 0.2 m, if it acts as a concave lens of 0.5m focal length when dipped in a liquid, the refractive index of the liquid is

Question:

Options :

(a) 17/8
(b) 15/8
(c) 13/8
(d) 9/8

Answer :

(b) 15/8

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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