A fish looking up through the water sees the outside world contained in a circular horizon. If the refractive index of water is 4/3 and the fish is 12 cm below the surface, the radius of this circle in cm is

Question:

Options :

(a) 36√5
(b) 4√5
(c) 36√7
(d) 36√7

Answer :

(d) 36√7

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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