Geo Optics 2

BITSAT 2015 Online › Optics questions › Geo Optics 2

A bird is flying up at an angle sin^-1 (3/5) with the horizontal .A fish in a pond looks at the bird . When it is vertically above the fish . The angle at which the bird appears to fly (to the fish) is: (n_water = 4/3)

A) sin^-1(3/5) B) sin^-1(4/5) C) 45^o D) sin^-1(9/16)

#Physics #Optics

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6 Answers

decoder ·2009-10-25 09:19:47

(c)

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UTTARA ·2009-10-25 09:21:31

I want the explanation plzz

U're ans is correct

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decoder ·2009-10-25 09:28:51

the velocity along the surface will not change!!!!!!!!..........

the velocity perpendicular to the surface, v_app = n(v_{actual perp. to surface})
= n(vsinÏ†)
=4/3 * 3v/5
=4v/5

now along the surface =vcosÏ†=4v/5
and perp. to the surface=4v/5

tanÎ¸=[4v/5] / [4v/5]
Î¸=45⁰

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UTTARA ·2009-10-25 09:33:31

@decoder u mean that the horizontal component of velocity doesn't change

That's it na?

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decoder ·2009-10-25 09:36:07

yup

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UTTARA ·2009-10-25 10:37:39

Thanks :)

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Geo Optics 2

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