Ray Optics.......................
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Ray Optics.......................

[From: ] [author: ] [Date: 12-03-24] [Hit: ]
If the refractive index of water is 4/3 ,and the fish is 12 cm below the water surface,(d) 4√5-the radius of the circle isr= h / square root of (u^2 - 1), where h is the depth and u is the refractive index.hence,r= 12 / square root of ( 16/9 - 1) = 36 / square root of (7).......
A fish looking up through 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 water surface, the radius of this circle in cm is :-

(a) 36(√7)

(b) 36 / √7

(c) 36(√5)

(d) 4√5

-
the radius of the circle is r= h / square root of (u^2 - 1), where 'h' is the depth and 'u' is the refractive index.

hence, r= 12 / square root of ( 16/9 - 1) = 36 / square root of (7). so the correct answer is (b)
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