# Optics and Light Quiz

DedicatedChrysocolla
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## 20 Questions

### Define Ray in the context of optics.

An imaginary line which tells us about the propagation of light energy

1÷60°

### What is the wavelength range for visible light?

4000 to 8000 Angstrom

### What does a source of light do?

Emits light energy and enables other objects to be visible

### What is shadow in the context of optics?

When the path of light ray is obstructed by an opaque object

### According to the given text, what is the formula for magnification?

$m = \frac{h_i}{h_o}$

Real object

### What is the net angle of deviation due to 2 inclined plane mirrors when the angle of incidence is less than the angle of inclination?

$\Delta = 360 - 2\theta$

### Why does the graph of angle of deviation and angle of incidence not touch the X-axis according to the given text?

Because angle of deviation cannot be zero

Two reflections

### What is the wavelength range for visible light?

4000 to 8000 Angstrom

### What is the limit of resolution for the human eye?

One minute or 1÷60°

### What does a source of light do?

Emits light energy

### Define Ray in the context of optics.

An imaginary line describing the propagation of light energy

### What is shadow in the context of optics?

An area where light is partially obstructed

180°

### If the angle of incidence is less than the angle of inclination, how many reflections are formed due to 2 inclined plane mirrors?

Three reflections

### What happens when the incident ray and the final reflected ray are antiparallel to each other in the case of two plane mirrors?

The angle of deviation is zero

### What is the net angle of deviation due to 2 inclined plane mirrors when the angle of incidence is less than the angle of inclination?

$360-2\theta$

### Why does the graph of angle of deviation and angle of incidence not touch the X-axis?

Because the angle of deviation cannot be zero

## Study Notes

### Optics Fundamentals

• A ray in optics is a line that represents the direction of light travel.

### Light and Human Eye

• The limit of resolution for the human eye is the minimum distance at which two objects can be distinguished as separate.
• Visible light has a wavelength range of approximately 400-700 nanometers.

• A source of light emits light energy.
• A shadow is the dark region formed when an object blocks light from reaching a surface.

### Magnification and Reflection

• The formula for magnification is not provided in the given text.
• In the context of reflection, the angle of incidence is defined with the help of the incident ray.

### Plane Mirrors and Deviation

• When two plane mirrors are inclined, the net angle of deviation is equal to the sum of the deviations produced by each mirror.
• If the angle of incidence is less than the angle of inclination, the graph of angle of deviation and angle of incidence does not touch the X-axis because the angle of deviation is never zero.
• In this case, the light suffers two reflections.
• When two plane mirrors are perpendicular to each other, the angle of deviation is 180 degrees.
• If the incident ray and the final reflected ray are antiparallel (opposite directions), the light has been rotated by 180 degrees.
• When the angle of incidence is less than the angle of inclination, two reflections are formed due to the 2 inclined plane mirrors.

Test your knowledge of optics and light with this quiz covering topics such as the nature of light, visible light spectrum, human eye sensitivity, and ray optics.

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