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  1. Problems
  2. /Optics

Optics

Physics

Reflection, refraction, and optical instruments.

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80 problems
Type:
1.
The program in this problem finds how much blue and red light is left in sunlight at different…
High School (9–10) · Light in the AtmosphereStemPy LabStemPy Lab
Hard
2.
Astronauts on a space station, far above most of the air, see a black sky even in full sunlight.
High School (9–10) · Light in the AtmosphereStemPy LabStemPy Lab
Hard
3.
Why are danger signals red? In a light haze of very small particles, how many times more is green…
High School (9–10) · Light in the AtmosphereStemPy LabStemPy Lab
Easy
4.
Sunlight crosses about 1/(sin h) times as much air as from overhead.
High School (9–10) · Light in the AtmosphereStemPy LabStemPy Lab
Medium
5.
The blue of the sky and the red of a sunset are both caused by scattering.
High School (9–10) · Light in the AtmosphereStemPy LabStemPy Lab
Easy
6.
Use the rule that scattering is proportional to 1/λ⁴.
High School (9–10) · Light in the AtmosphereStemPy LabStemPy Lab
Medium
7.
Thin clouds look white. A thick rain cloud looks grey, or even dark. Why the difference?
High School (9–10) · Light in the AtmosphereStemPy LabStemPy Lab
Medium
8.
Very small particles scatter light in proportion to 1/λ⁴.
High School (9–10) · Light in the AtmosphereStemPy LabStemPy Lab
Medium
9.
Say whether the Tyndall effect is the cause of what we see.
High School (9–10) · Light in the AtmosphereStemPy LabStemPy Lab
Easy
10.
At sunset the Sun looks flattened, wider than it is tall. Explain. Why does it look round at noon?
High School (9–10) · Light in the AtmosphereStemPy LabStemPy Lab
Medium
11.
At a place, the true sunrise (without the air) is at 5:47 in the morning, and the true sunset is at…
High School (9–10) · Light in the AtmosphereStemPy LabStemPy Lab
Medium
12.
On a night of very still air, stars twinkle less than usual.
High School (9–10) · Light in the AtmosphereStemPy LabStemPy Lab
Medium
13.
Light from a star that is truly 70° from overhead comes down through the air.
High School (9–10) · Light in the AtmosphereStemPy LabStemPy Lab
Easy
14.
The red bow of a rainbow is 42° from the point opposite the Sun.
High School (9–10) · Prisms and Dispersion of LightStemPy LabStemPy Lab
Hard
15.
On a showery afternoon the Sun is 24° above the horizon, and you see two rainbows.
High School (9–10) · Prisms and Dispersion of LightStemPy LabStemPy Lab
Medium
16.
Explain why a rainbow is a bow (part of a circle), and why red is on the outside and violet on the…
High School (9–10) · Prisms and Dispersion of LightStemPy LabStemPy Lab
Medium
17.
A student wants to make a rainbow with a garden hose on a sunny afternoon, when the Sun is 35° high.
High School (9–10) · Prisms and Dispersion of LightStemPy LabStemPy Lab
Easy
18.
For a glass, the refractive index depends on the wavelength: n = 1.5046 + 0.0042/λ², with λ in…
High School (9–10) · Prisms and Dispersion of LightStemPy LabStemPy Lab
Hard
19.
Newton turned a second prism upside down and got white light back.
High School (9–10) · Prisms and Dispersion of LightStemPy LabStemPy Lab
Medium
20.
A narrow beam of pure red light goes through a prism.
High School (9–10) · Prisms and Dispersion of LightStemPy LabStemPy Lab
Medium
21.
A glass has a refractive index of 1.509 for red light and 1.524 for violet light.
High School (9–10) · Prisms and Dispersion of LightStemPy LabStemPy Lab
Medium
22.
White light goes through a prism. For which colour does the glass have the largest refractive index?
High School (9–10) · Prisms and Dispersion of LightStemPy LabStemPy Lab
Easy
23.
A ray goes through a 60° prism of refractive index 1.55 symmetrically, with i = e.
High School (9–10) · Prisms and Dispersion of LightStemPy LabStemPy Lab
Hard
24.
A ray falls on a prism of angle 55° and refractive index 1.52, at an angle of incidence of 45°.
High School (9–10) · Prisms and Dispersion of LightStemPy LabStemPy Lab
Medium
25.
A ray goes through a prism of angle 60°.
High School (9–10) · Prisms and Dispersion of LightStemPy LabStemPy Lab
Medium
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