Question

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Answer 1

Answer:

25°

Step-by-step explanation:

do you know I angle of incidence is always equal to angle of reflection

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Answer 2

Answer:

Refracted ray makes an angle of 19°

Step-by-step explanation:

The relation between incident ray and refracted ray is known as snell's law

$n_{1}$ sin∅$_{1}$ = $n_{2}$ sin ∅$_{2}$

where, $n_{1}$ = refractive index of first area

           $n_{2}$ =  refractive index of second area

         ∅$_{1}$ , ∅$_{2}$  are angles ray make with normal in both area of substance

by above formula we have

           $n_{1}$ =  refractive index of air = 1

           $n_{2}$ =  refractive index of water = 1.33

            ∅$_{1}$ = angle with normal in air

now ,

       1x sin(25°) = 1.33 sin(r)

       sin(r) = 0.42/1.33       (∴ Sin(25°) = 0.42 )

               = 0.3177

      r = $Sin^{-}$(.3177)

     r= 18.66 ≅ 19