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<<<Interactive Quizzes on Light Reflection and Mirrors >>>

Interactive Physics Quizzes

Comprehensive quizzes on light reflection and mirrors

Light Reflection Plane Mirrors Concave and Convex Mirrors

Light Reflection Quiz

Choose the correct answer for each question. Your answer will be colored green if correct or red if wrong, and the explanation will be displayed automatically.

1. What is the angle of reflection if the angle of incidence is 30 degrees?

A

15 degrees

B

30 degrees

C

60 degrees

D

90 degrees

According to the first law of reflection, the angle of incidence equals the angle of reflection. Therefore, if the angle of incidence is 30 degrees, the angle of reflection is also 30 degrees.

2. Which of the following statements is true according to the first law of reflection?

A

The incident ray, the reflected ray, and the focal length are all in the same plane

B

The incident ray, the reflected ray, and the normal at the point of incidence are all in the same plane

C

The angle of incidence is equal to twice the angle of reflection

D

The incident ray is perpendicular to the reflected ray

The first law of reflection states that the incident ray, the reflected ray, and the normal at the point of incidence on the reflecting surface all lie in the same plane.

3. If a light ray falls perpendicularly on a reflecting surface, what is the value of the angle of reflection?

A

0 degrees

B

30 degrees

C

45 degrees

D

90 degrees

When the ray falls perpendicularly to the surface, the angle of incidence is 0 degrees (between the ray and the normal). According to the law of reflection, the angle of reflection equals the angle of incidence, so it will also be 0 degrees.

4. If a ray incident on a plane mirror makes an angle of 30 degrees with it, what is the angle between the incident ray and the reflected ray?

A

30°

B

120°

C

90°

D

60°

If the incident ray makes an angle of 30 degrees with the mirror, then the angle of incidence (measured from the normal) is 90 - 30 = 60 degrees. According to the law of reflection, the angle of reflection = angle of incidence = 60 degrees. The angle between the incident and reflected ray = angle of incidence + angle of reflection = 60 + 60 = 120 degrees.

5. What type of reflection occurs when light falls on a rough surface?

A

Regular reflection

B

Irregular reflection

C

Total reflection

D

Internal reflection

When light falls on a rough surface, it reflects in random directions due to the irregularity of the surface. This is called irregular reflection, unlike regular reflection which occurs on smooth surfaces like mirrors.

6. If the angle between the incident ray and the reflected ray is 80 degrees, what is the angle of incidence?

A

20 degrees

B

40 degrees

C

80 degrees

D

160 degrees

The angle between the incident ray and the reflected ray is the sum of the angle of incidence and the angle of reflection. According to the law of reflection, the angle of incidence = angle of reflection. So: angle of incidence + angle of reflection = 80 degrees, and since they are equal, the angle of incidence = 40 degrees.

7. What characteristic distinguishes regular reflection from irregular reflection?

A

Regular reflection occurs on rough surfaces

B

Regular reflection produces parallel rays after reflection

C

Irregular reflection produces clear images

D

Irregular reflection occurs only on mirrors

Regular reflection occurs on smooth surfaces like mirrors, where parallel light rays are reflected as parallel rays, producing clear images. Irregular reflection occurs on rough surfaces where rays are scattered in different directions.

8. If a light ray is reflected at an angle of 55 degrees relative to the normal, what is the angle of incidence?

A

35 degrees

B

55 degrees

C

110 degrees

D

125 degrees

According to the second law of reflection, the angle of incidence equals the angle of reflection. If the angle of reflection is 55 degrees, then the angle of incidence is also 55 degrees.

9. If a plane mirror is rotated by an angle of 15 degrees around an axis in its plane, by how many degrees will the reflected ray rotate?

A

60°

B

45°

C

30°

D

15°

When the mirror is rotated by an angle θ, the angle of incidence changes by the same amount. Since the angle of reflection equals the angle of incidence, the change in the angle of reflection equals the change in the angle of incidence. Therefore, the reflected ray will rotate by an angle equal to twice the angle of rotation of the mirror, i.e., 2 × 15 = 30 degrees.

10. If the angle between the incident ray and the reflecting surface is 30 degrees, what is the angle of reflection?

A

30 degrees

B

60 degrees

C

90 degrees

D

120 degrees

The angle of incidence is measured between the incident ray and the normal to the surface. If the angle between the incident ray and the surface is 30 degrees, then the angle of incidence is 90 - 30 = 60 degrees. According to the law of reflection, the angle of reflection equals the angle of incidence, i.e., 60 degrees.

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Plane Mirrors Quiz

Choose the correct answer for each question. The result will appear automatically after your selection.

1. What is the nature of the image formed in a plane mirror?

A

Real inverted

B

Real erect

C

Virtual erect

D

Virtual inverted

The image in a plane mirror is always virtual (because it cannot be captured on a screen) and erect (not inverted) and its distance is equal to the distance of the object from the mirror.

2. If a person 180 cm tall stands 2 meters from a plane mirror, what is the length of his image in the mirror?

A

90 cm

B

180 cm

C

360 cm

D

45 cm

In a plane mirror, the image length is equal to the actual object length regardless of the object's distance from the mirror. Therefore, the image length will be 180 cm like the original object.

3. If an object approaches a plane mirror, what happens to its image?

A

Increases in size and approaches the mirror

B

Decreases in size and approaches the mirror

C

Its size remains constant and it approaches the mirror

D

Its size remains constant and it moves away from the mirror

In a plane mirror, the image size remains constant (equal to the object size) regardless of the object's distance from the mirror. But when the object approaches the mirror, its image also approaches the mirror by the same amount.

4. Which correctly describes the relationship between the object and its image in a plane mirror?

A

The image is inverted upside down

B

The image is laterally inverted

C

The image is larger than the object

D

The image is real and can be captured on a screen

The image in a plane mirror is laterally inverted, meaning the right side of the object appears as the left side in the image and vice versa. But it is not inverted upside down (it remains erect).

5. If you place a plane mirror on the ground and see the image of the sun in it, what type of image is this?

A

Real inverted

B

Real erect

C

Virtual erect

D

Virtual inverted

All images in plane mirrors are virtual and erect, whether for the sun or any other object. A virtual image is one that cannot be captured on a screen.

6. What is the minimum length of a plane mirror needed by a person 170 cm tall to see his full image?

A

170 cm

B

85 cm

C

42.5 cm

D

340 cm

The minimum mirror length that enables a person to see his full image is half the person's height. This is because light rays from the top and bottom of the object reflect off the mirror at specific angles that allow viewing the full object if the mirror is half the object's height.

7. If a person stands 2 meters from a plane mirror, then moves 1 meter farther away, what is the distance between the person and his image after moving?

A

3 m

B

6m

C

2 m

D

4m

After moving, the person is 3 meters from the mirror. Since the image in a plane mirror is at a distance equal to the object's distance from the mirror, the image distance from the mirror is also 3 meters. Therefore, the distance between the person and his image is 3 + 3 = 6 meters.

8. If an object moves at 2 m/s away from a plane mirror, what is the speed of the image relative to the object?

A

1 m/s

B

4 m/s

C

2 m/s

D

0 m/s

When the object moves away from the mirror at 2 m/s, the image distance from the mirror increases at the same rate. But relative to the object, the image moves away at twice this speed (4 m/s) because the distance between the object and the image is twice the distance between the object and the mirror.

9. How many images are formed when an object is placed between two perpendicular plane mirrors?

A

1

B

2

C

3

D

4

When the two mirrors are perpendicular, the number of images is given by the relation n = (360/θ) - 1, where θ is the angle between the mirrors. Here θ = 90 degrees, so n = (360/90) - 1 = 4 - 1 = 3 images.

10. If an object is placed 40 cm from a plane mirror, and then the mirror is moved 10 cm away from the object, what is the new distance between the object and its image?

A

50 cm

B

80cm

C

100 cm

D

12cm

Distance between object and its image = 2 × Distance between object and mirror Initially: Distance between object and mirror = 40 cm, so distance between object and image = 80 cm After moving the mirror 10 cm away from the object, the distance between object and mirror becomes = 40 + 10 = 50 cm New distance between object and image = 2 × 50 = 100 cm

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Concave and Convex Mirrors Quiz

Choose the correct answer for each question then click "Check" to see the result and solution method.

1. Which of the following statements is true for a concave mirror?

A

It always forms diminished virtual images

B

Its reflecting surface is curved inward

C

It diverges the light rays falling on it

D

It cannot form real images

A concave (spherical) mirror is a mirror whose reflecting surface is curved inward (concave). It can form real or virtual images depending on the object's distance from it, and it converges the light rays falling on it rather than diverging them.

2. If an object is placed at a distance greater than the focal length of a concave mirror, what type of image is formed?

A

Real inverted

B

Virtual erect

C

Virtual inverted

D

Real erect

When the object is at a distance greater than the focal length of a concave mirror, a real inverted image is formed. A real image can be captured on a screen.

3. What type of image does a convex mirror always form?

A

Real inverted

B

Real erect

C

Virtual diminished erect

D

Virtual magnified inverted

A convex mirror always forms virtual images (cannot be captured on a screen), diminished (smaller than the object), and erect (not inverted) regardless of the object's distance from it.

4. If an object is placed at a distance equal to the radius of curvature of a concave mirror, where is its image formed?

A

At the focus

B

At the radius of curvature

C

At infinity

D

At twice the radius of curvature

The radius of curvature (R) is equal to twice the focal length (f). When an object is placed at R from a concave mirror (i.e., at the center of curvature), the image is formed at the same distance R on the other side of the mirror, of the same size as the object but inverted.

5. What is the common use of convex mirrors?

A

In microscopes

B

In car side mirrors

C

In astronomical telescopes

D

In camera lenses

Convex mirrors are commonly used in car side-view mirrors because they provide a wider field of view (although they diminish images). They are also used in store corners to monitor blind spots.

6. If an object is placed at the focus of a concave mirror, where is its image formed?

A

At the focus

B

At the center of curvature

C

At infinity

D

No image is formed

When an object is placed at the focus (f) of a concave mirror, the reflected rays are parallel and do not converge, so the image is considered to be formed at infinity.

7. What is the main difference between concave and convex mirrors in terms of ray reflection?

A

Concave diverges rays and convex converges them

B

Concave converges rays and convex diverges them

C

Both converge rays in the same way

D

Both diverge rays in the same way

A concave mirror converges parallel light rays falling on it to a single point (the focus), while a convex mirror diverges parallel light rays falling on it as if they came from a virtual focus behind the mirror.

8. If the focal length of a convex mirror is 20 cm, what is its radius of curvature?

A

10 cm

B

20 cm

C

40 cm

D

5 cm

The radius of curvature (R) is equal to twice the focal length (f). The relation is R = 2f. Here f = 20 cm (noting that the focal length of a convex mirror is considered negative in calculations), so R = 2 × 20 = 40 cm.

9. Where should an object be placed in front of a concave mirror to form an image equal in size to the object?

A

At the focus

B

At the center of curvature

C

Between the focus and the center of curvature

D

Between the pole of the mirror and the focus

When an object is placed at the center of curvature (at a distance equal to the radius of curvature) of a concave mirror, a real image is formed at the same distance from the mirror, of the same size as the object but inverted.

10. What is the common use of concave mirrors?

A

In medical glasses

B

In shaving mirrors and for focusing light

C

In television screens

D

In sunglass lenses

Concave mirrors are used in shaving and makeup mirrors because they produce magnified images when the object is between the focus and the mirror. They are also used in light collectors (like solar ovens) because they converge light rays to a single point.

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