# Ultimate Optics Challenge: Light And Reflection Quiz

By Junho Song
Junho Song, Physics/Science Teacher
Junho Song, a dedicated educator, specializes in teaching physics and science. Passionate about inspiring students in the fascinating world of scientific discovery and understanding.
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Questions: 12 | Attempts: 1,600

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Dive into the fascinating world of optics with our quiz, 'Ultimate Optics Challenge: Light and Reflection.' Explore the principles of light and reflection in this immersive quiz that combines fun and learning. Test your knowledge of the behavior of light as it interacts with surfaces, mirrors, and lenses.

From understanding the laws of reflection to deciphering complex optical phenomena, this quiz is designed to challenge and educate enthusiasts of all levels. Whether you're a physics buff or simply curious about the science behind vision and optics, this quiz promises an engaging exploration of fundamental principles.

Unravel the mysteries of refraction, Read morereflection, and optical devices in a dynamic and interactive format. Take the 'Ultimate Optics Challenge: Light and Reflection Quiz' to illuminate your understanding of the captivating science of optics.

• 1.

### Calculate the index of refraction for an object in which light travels at 1.97 x 108 m/s.

• A.

1.52 x 108 m/s

• B.

0.66 m/s

• C.

1.52 m/s

• D.

1.95

• E.

1.52

E. 1.52
Explanation
The index of refraction is a measure of how much a material slows down the speed of light compared to its speed in a vacuum. In this case, the speed of light in the object is given as 1.97 x 10^8 m/s. The correct answer, 1.52, is the index of refraction that corresponds to this speed. This means that light travels approximately 1.52 times slower in this object compared to its speed in a vacuum.

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• 2.

### A light ray has an angle of incidence of 34Âº. The reflected ray will make what angle with the reflecting surface?

• A.

0Âº

• B.

34Âº

• C.

56Âº

• D.

66Âº

• E.

74Âº

C. 56Âº
Explanation
When a light ray reflects off a surface, the angle of incidence is equal to the angle of reflection. In this case, the angle of incidence is 34Âº, so the angle of reflection will also be 34Âº. However, since the question asks for the angle the reflected ray makes with the reflecting surface, we need to subtract the angle of reflection from 90Âº (since the angle of incidence and reflection form a straight line with the normal to the surface). Therefore, the angle the reflected ray makes with the reflecting surface is 90Âº - 34Âº = 56Âº.

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• 3.

### A YAG laser has a frequency of 2.8 Â´ 1014 Hz. What is the wavelength of the light it produces?

• A.

1.2 x 10â€“23 m

• B.

1.1 x 10â€“6 m

• C.

1.2 x 10â€“2 m

• D.

9.4 x 105 m

• E.

8.5 x 10â€“22 m

B. 1.1 x 10â€“6 m
Explanation
The wavelength of light is inversely proportional to its frequency. This means that as the frequency increases, the wavelength decreases. Since the YAG laser has a high frequency of 2.8 Â´ 1014 Hz, it will produce light with a short wavelength. The correct answer, 1.1 x 10â€“6 m, represents a short wavelength and is therefore the most appropriate choice.

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• 4.

### An student is located 1.8 m from a plane mirror. How far is the image from the student?

• A.

0 m

• B.

0.9 m

• C.

1.8 m

• D.

2.7 m

• E.

3.6 m

E. 3.6 m
Explanation
The distance between the student and the mirror is given as 1.8 m. In a plane mirror, the image formed is located at the same distance behind the mirror as the object is in front of it. Therefore, the image is also located at a distance of 1.8 m from the mirror. Since the image is formed behind the mirror, the distance from the student to the image is the sum of the distance from the student to the mirror and the distance from the mirror to the image, which is 1.8 m + 1.8 m = 3.6 m.

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• 5.

### The image in a plane mirror is

• A.

Upright and virtual

• B.

Laterally inverted and virtual

• C.

Inverted and virtual

• D.

Two of A, B, and C

• E.

All of A, B, and C

D. Two of A, B, and C
Explanation
The image in a plane mirror is laterally inverted and virtual. When an object is reflected in a plane mirror, the image appears to be flipped horizontally, which is known as lateral inversion. Additionally, the image is virtual, meaning it cannot be projected onto a screen. The image is not upright, as it appears to be flipped horizontally. Therefore, the correct answer is "laterally inverted and virtual."

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• 6.

### An object is placed between F and C of a concave mirror.  The image will be located:

• A.

Beyond C

• B.

Between F and C

• C.

Between F and the vertex

• D.

Behind the mirror

• E.

Not enough information provided

A. Beyond C
Explanation
When an object is placed between the focal point (F) and the center of curvature (C) of a concave mirror, the image formed will be located beyond the center of curvature (beyond C). This is because in this position, the rays of light from the object are reflected by the mirror and converge to form a real and inverted image beyond the center of curvature.

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• 7.

### An object is located at the focal point for a convex mirror.  The image produced will be

• A.

Inverted and real

• B.

Upright and real

• C.

Inverted and virtual

• D.

Upright and virtual

• E.

No image will be produced

D. Upright and virtual
Explanation
When an object is located at the focal point of a convex mirror, the image produced will be upright and virtual. This is because convex mirrors always produce virtual images that are smaller than the object. The image will be upright because the light rays reflect off the mirror and diverge, creating an image that is the same orientation as the object. However, the image will be virtual because the light rays do not actually converge at a point to form a real image. Instead, they appear to diverge from a point behind the mirror, creating a virtual image that cannot be projected onto a screen.

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• 8.

### Objects placed between F and the vertex of a concave mirror will produce images that are:

• A.

Larger than the object

• B.

Virtual

• C.

Upright

• D.

Two of A, B and C

• E.

All of A, B and C

D. Two of A, B and C
Explanation
When an object is placed between the focal point (F) and the vertex of a concave mirror, the image formed is virtual and upright. However, the size of the image can vary. If the object is placed closer to the vertex, the image will be larger than the object. Therefore, the correct answer is "two of A, B, and C" because the images produced will be virtual and upright, but the size will depend on the specific placement of the object.

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• 9.

### Sometimes rays of light approaching curved mirrors do not all meet at the focal point.  This is due to a phenomenon known as:

• A.

Refraction

• B.

Chromatic abberation

• C.

Spherical abberation

• D.

Dispersion

• E.

Diffraction

C. Spherical abberation
Explanation
Spherical aberration occurs when rays of light passing through a curved mirror do not all converge at a single focal point. This happens because the outer rays of the light beam focus closer to the mirror than the central rays, causing a blurred or distorted image. Refraction refers to the bending of light when it passes through different mediums, chromatic aberration is the dispersion of light into different colors, dispersion is the separation of light into its component wavelengths, and diffraction is the bending of light around obstacles or through small openings.

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• 10.

### To properly use a shaving mirror (vanity mirror) your face must be located:

• A.

On the focal point

• B.

Between the focal point and the mirror

• C.

On the centre of curvature

• D.

Beyond the centre of curvature

• E.

Between the centre of curvature and the focal point

B. Between the focal point and the mirror
Explanation
To properly use a shaving mirror, your face must be located between the focal point and the mirror. This is because a shaving mirror is a convex mirror, which means it curves outward. In a convex mirror, the focal point is located behind the mirror. Placing your face between the focal point and the mirror allows you to see a magnified image of your face. If your face is located on the focal point or beyond the centre of curvature, the image will be distorted or appear smaller.

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• 11.

### When driving at night, headlights of cars viewed in the rearview mirror can be a distraction for the driver.  This helps reduce the amount of light entering your eyes because

• A.

Only a small percentage of light is reflected off the glass surface

• B.

Only a small percentage of light is reflected off the silvered surface

• C.

The light reflecting off the glass is sent away from the driver's eyes

• D.

The light entering the eyes are of a different colour

• E.

Light entering the glass is absorbed by the glass to make it dimmer

A. Only a small percentage of light is reflected off the glass surface
Explanation
When the headlights of cars are viewed in the rearview mirror, only a small percentage of light is reflected off the glass surface. This means that most of the light is not reflected back into the driver's eyes, reducing the distraction caused by the headlights.

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• 12.

### A convex mirror of focal length 10 cm is used to create an image of a duck one-third its original height.  The duck must be located:

• A.

5 cm from the mirror

• B.

10 cm from the mirror

• C.

15 cm from the mirror

• D.

20 cm from the mirror

• E.

30 cm from the mirror

D. 20 cm from the mirror
Explanation
The image created by a convex mirror is always virtual, upright, and diminished in size. In this case, since the image is one-third the height of the original duck, it means that the image is smaller than the object. According to the mirror formula, the distance of the object (u) and the distance of the image (v) are related by the equation 1/f = 1/v - 1/u, where f is the focal length of the mirror. By substituting the given values, we can solve for u. In this case, the object distance (u) is 20 cm from the mirror, which is the correct answer.

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Junho Song |Physics/Science Teacher |
Junho Song, a dedicated educator, specializes in teaching physics and science. Passionate about inspiring students in the fascinating world of scientific discovery and understanding.

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