# Vật Lí 9 Bài 41: Quan hệ giữa góc tới và góc khúc xạ – Giải bài tập SGK Vật Lí 9 Bài 41

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Physics 9 Lesson 41: The relationship between the angle of incidence and the angle of refraction, prepared by the teachers of Cmm.edu.vn, hopes to be a useful document to help students master the lesson knowledge and achieve good results in these lessons. exams and tests in class.

## Summary of Physics 9 Lesson 41

– When light rays travel from air to different solid and liquid transparent media, the angle of refraction is smaller than the angle of incidence and vice versa.

Rays of light pass from air into a glass prism Rays of light pass from air to water

– As the angle of incidence increases (or decreases), the angle of refraction also increases (decreases). – When the angle of incidence is 00, the angle of refraction is also equal to 00, the light ray is not broken when traveling straight through the two media.

Note: When a light ray passes from a transparent medium (solid or liquid) to an air medium with an angle of incidence i > 48030′, total reflection occurs (light rays do not go out of the solid medium). transparent liquid or solid, it is not refracted but is totally reflected at the interface between water and air) ## Solve the exercises in the Physics textbook 9 Lesson 41

### Lesson C1 (page 111 Physics Textbook 9)

Prove that the line connecting the positions A, I, A’ in Figure 41.1 Textbook is the path of light rays from pin A to the eye.

Putting the eye on the curved edge of the glass, we see that there is only one position where the image of the pin A through the glass can be observed. This proves that the light emitted from A is transmitted to the slit I into the glass and then to the eye. When only the pin A’ is seen, it means that A’ has obscured I and A, so the light emitted from A cannot reach the eye. So the line connecting the positions A, I, A’ is the path of the light ray from the pin A to the eye.

### Lesson C2 (page 111 Physics Textbook 9)

Describe the path of light rays from air to glass. Indicate incident ray, refracted ray, angle of incidence, and angle of refraction. Measure the magnitude of the angle of refraction and record it in Table 1.

Light rays pass from air into glass (or transparent plastic), and are refracted at the interface between air and glass.

+ who is the incident ray, IA’ is the refracted ray, angle ∠NIA is the angle of incidence, angle ∠N’TA’ is the angle of refraction (figure). Complete Table 1 (illustrating the data) ### Lesson C3 (page 112 Physics Textbook 9)

In Figure 41.2, the textbook shows that M is the position of the eye to see the image of a small pebble in the water, A is the actual position of the pebble, B is its image position, and PQ is the water surface. Draw the path of the light ray from the pebble to the eye. The path of the light ray from the pebble to the eye is shown in Figure 41.2a. – Connect B to M and cut PQ at I.

– Connecting I to A we have a path of light rays from A to the eye.

### Lesson C4 (page 112 Physics Textbook 9)

In Figure 41.3 Textbook, SI is the incident ray. The refracted ray of this ray coincides with one of the lines IH, IE, IG, IK. Fill in an arrow mark on that refracted ray. The arrow mark is placed on the IG line as shown in Figure 41.3a.

IG is the line showing the refraction of the incident ray SI, because when the light ray travels from air to water, the angle of refraction is smaller than the angle of incidence. ## Physics Quiz 9 Lesson 41 with answers

Lesson 1: We have the incident ray and the refracted ray coincide when

A. angle of incidence is 0.

B. angle of incidence equals angle of refraction.

C. angle of incidence is greater than the angle of refraction.

D. angle of incidence is less than angle of refraction.

We have:

When the angle of incidence is 00, the angle of refraction is 00, the light ray is not broken when it passes through the two media.

=> The incident ray and the refracted ray coincide when the angle of incidence is 00

Exercise 2: When a light ray passes from air into water, let i be the angle of incidence and r the angle of refraction, then

A. r < I

B. r > i

C. r = I

D. 2r = i

We have: When light rays travel from air to different solid and liquid transparent media, the angle of refraction is smaller than the angle of incidence.

r < i

Lesson 3: When light travels from air to glass,

A. The angle of refraction r does not depend on the angle of incidence i.

B. The angle of incidence i is less than the angle of refraction r.

C. As the angle of incidence i increases, the angle of refraction r decreases.

D. As the angle of incidence i increases, the angle of refraction r increases.

We have:

When light rays travel from air to different solid and liquid transparent media, the angle of refraction is smaller than the angle of incidence.

As the angle of incidence increases (decreases), the angle of refraction also increases (decreases).

Exercise 4: Consider a ray of light traveling from air to water. Which of the following information is incorrect?

A. The angle of incidence is always greater than the angle of refraction.

B. As the angle of incidence increases, the angle of refraction also increases.

C. When the angle of incidence is 00, the angle of refraction is also 00

D. When the angle of incidence is 450, the angle of refraction is 450

A, B, C – right

D – false because: The angle of refraction is smaller than the angle of incidence

Lesson 5: A person sees a pebble at the bottom of a basin filled with water. Which of the following information is incorrect?

A. The light ray from the pebble to the eye travels along a kink.

B. The light ray from the pebble to the eye travels in a straight line.

C. The image of the pebble is above the actual position of the pebble.

D. The ray of light traveling from the pebble to the eye has an angle of incidence less than the angle of refraction.

A, C, D – right

B – wrong because: The light ray from the pebble to our eyes is refracted when traveling from water to air => bent

Lesson 6: A coin is placed in a pot. Place your eyes about an hour away from the mouth of the pot. When there is no water, the coin cannot be seen, but when water is added, the coin can be seen because:

A. there is refraction of light.

B. has total internal reflection.

C. has light reflection.

D. has direct transmission of light. Due to the phenomenon of light refraction, when water is poured in, the image of the object is shifted up a segment

=> the eye can see the coin

Exercise 7: Consider a ray of light passing from air into water, let i and r be the angle of incidence and angle of refraction. Which of the following is FALSE?

A. I > r

B. When i increases, r also increases

C. When i increases, r decreases

D. When I = 00 then r = 00

We have:

When light rays travel from air to different solid and liquid transparent media, the angle of refraction is smaller than the angle of incidence.

As the angle of incidence increases (decreases), the angle of refraction also increases (decreases).

When the angle of incidence is 00, the angle of refraction is 00, the light ray is not broken when it passes through the two media.

=> options:

A, B, D – right

C – false

Lesson 8: When we increase the angle of incidence, how does the angle of refraction change?

A. Angle of incidence increases, angle of refraction decreases

B. Angle of incidence increases, angle of refraction increases

C. Angle of incidence increases, angle of refraction remains constant

D. Both b and c are correct

We have: As the angle of incidence increases (decreases), the angle of refraction also increases (decreases).

=> options

A, C – false => D – false

B – right

Lesson 9: A ray of light emitted from a light bulb in an aquarium, shines upward, obliquely to the surface of the water and emerges into the air:

A. The angle of refraction will be larger than the angle of incidence

B. The angle of refraction will be equal to the angle of incidence

C. The angle of refraction will be less than the angle of incidence

D. All three cases A, B, C are possible

We have:

When light rays travel from air to different solid and liquid transparent media, the angle of refraction is smaller than the angle of incidence.

And conversely, when light rays travel from water to air, the angle of refraction is larger than the angle of incidence

Lesson 10: We have the following table: Which of the following matches each part in column A with each part in column B is correct?

We have the following table:

 A REMOVE a. The phenomenon of light refraction is the phenomenon of incident rays when meeting the separation between two different transparent media 1. angle of refraction is greater than angle of incidence b. When light rays pass from air to water, 2. being thrown back into the old transparent environment c. When light rays pass from water to air, 3. angle of refraction is less than angle of incidence d. Reflection of light is the phenomenon where incident rays meet at the separation between two media 4. the angle of refraction is also zero, the ray is not broken when passing through the two media e. When the angle of incidence is 0, then 5. is broken at the interface and continues into the second transparent medium. The angle of refraction is not equal to the angle of incidence

Which of the following options matches each part in column A with each part in column B?

A. a – 2

B. b – 1

C. c – 3

D. e – 4

We have, each part in column A with each part in column B matched, respectively:

a – 5; b – 3; c – 1; d – 2; e – 4

=> options:

A, B, C – false

D – right

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Above is the content of the Physics lesson 9 Lesson 41: The relationship between the angle of incidence and the angle of refraction prepared by the teachers of Cmm.edu.vn including the theory part, problem solving and multiple choice questions with answers. full. Hope they will master the knowledge about the relationship between angle of incidence and angle of refraction. Wish you all the best in your studies and always get high scores in class tests.

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