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Reptile [31]
3 years ago
5

A ray of light is incident on a flat surface of a block of polystyrene, with an index of refraction of 1.49, that is submerged i

n water. The ray is split at the surface, where the angle of refraction of the transmitted ray is 19.1°. What is the angle of reflection (in degrees) of the reflected ray?
Physics
1 answer:
Crazy boy [7]3 years ago
4 0

Answer:

21.5°

Explanation:

Given,

Refractive index of water, n₁ = 1.33

Refractive index of polystyrene, n₂ = 1.49

Angle of reflection = ?

Angle of refraction = 19.1°

Using Snell's law

n₁ sin θ₁ = n₂ sin θ₂

1.33 x sin θ₁ = 1.49 x sin 19.1°

sin θ₁ = 0.366

θ₁  = 21.5°

According to law of reflection angle of incidence is equal to angle of reflection.

Angle of reflection =  21.5°

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2. Adelia holds a shiny steel spoon with its back (convex surface) facing her eyes at a distance
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Answer:

(a) The convex mirror image, is always upright at all positions, while images formed by concave mirrors are always inverted when the object distance from the mirror is more than the mirrors focal length.

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3 years ago
A spinning disc rotating at 130 rev/min slows and stops 31 s later. how many revolutions did the disc make during this time?
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F = 130 revs/min = 130/60 revs/s = 13/6 revs/s
t = 31s
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3 years ago
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