Q: Which law explains why the angle of incidence equals the angle of reflection for a light ray striking a plane mirror?

Law of Reflection: $$\theta_i = \theta_r$$

Question 1

Which law explains why the angle of incidence equals the angle of reflection for a light ray striking a plane mirror?

Accepted Answer

Law of Reflection: $$	heta_i = 	heta_r$$

Question 2

A coin lies at the bottom of a pan of water. Due to refraction, how does the coin appear to an observer looking from above?

Accepted Answer

It appears shallower than it actually is.

Question 3

What is the minimum height of a plane mirror required for a person of height $$h to $$see their full-length image?

Accepted Answer

$$\frac{1}{2}h$$

Question 4

When light passes from air into water at an angle, which of the following correctly describes the change in direction?

Accepted Answer

The light bends toward the normal.

Question 5

Which equation describes the relationship between the angles of incidence and refraction when light passes from one medium to another?

Accepted Answer

$$n_1$$ \sin \$$theta_1$$ = $$n_2$$ \sin \$$theta_2$$

Question 6

A fish underwater looks up and sees the world above through a circular 'window' due to refraction. What is the angular size of this window?

Accepted Answer

$$96^\circ$$

Question 7

What phenomenon allows fiber optic cables to transmit light over long distances with minimal loss?

Accepted Answer

Total internal reflection

Question 8

During a solar eclipse, what is the region called where the Sun is completely blocked by the Moon?

Accepted Answer

Umbra

Question 9

A lifeguard wants to reach a swimmer in distress as quickly as possible, running on sand and then swimming in water. Which principle determines the optimal path?

Accepted Answer

Fermat's Principle (least time)

Question 10

Which of the following best describes the image formed by a convex lens in the human eye?

Accepted Answer

A real, inverted image on the retina

Question 11

What happens to the direction of a light ray as it passes from a medium with a lower index of refraction to a higher index of refraction?

Accepted Answer

It bends toward the normal.

Question 12

Which of the following is an example of diffuse reflection?

Accepted Answer

Light reflecting off a rough stone wall

Question 13

A ray of light passes from air into glass at an angle. Which path does it follow?

Accepted Answer

It bends toward the normal.

Question 14

If the angle of incidence in water exceeds the critical angle, what happens to the light ray at the water-air interface?

Accepted Answer

It is totally internally reflected.

Question 15

Which of the following best explains why you can see your image in a mirror but not on a wall?

Accepted Answer

The mirror produces specular reflection, while the wall produces diffuse reflection.

Question 16

A ray of light strikes a glass-air boundary at the critical angle. What is the angle of refraction?

Accepted Answer

$$90^\circ$$

Question 17

Which path will a light ray take when it enters a prism and exits on the other side?

Accepted Answer

It will bend twice, once entering and once exiting, due to refraction.

Question 18

What is the main reason binoculars use prisms inside their structure?

Accepted Answer

To invert and reflect the image for correct orientation

Question 19

A ball is suspended between a lamp and a wall. What will be observed on the wall?

Accepted Answer

A shadow with a sharp umbra and a fuzzy penumbra

Question 20

Which of the following best describes the path of light in a medium with varying refractive index, such as a mirage?

Accepted Answer

It bends gradually, following the gradient of refractive index.

Thermodynamics and the Macroscopic Description of Matter

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