2nd Physical Science Summative Exam (4th Quarter)

Two flat mirrors are perpendicular to each other as shown in the figure. An incoming beam of light makes an angle of 15˚ with the first mirror. What angle will the outgoing beam make with the second mirror?

• 15˚

• 30˚

• 75˚

• 90˚

Which of the following best describes a Normal line?

• The path is taken by the rays of light as it approaches the surface

• An imaginary line is drawn perpendicular to the reflecting surface

• Line parallel to the incident and reflected ray

• The total distance traveled by light upon reflecting

Which is scattered by very small particles present in the atmosphere?

• All wavelengths of light

• Medium wavelength of light

• Smaller wavelength of light

• Larger wavelength of light

What do you call the phenomenon by which the incident light falling on the surface is sent back into the same medium?

• Absorption

• Reflection

• Polarization

• Refraction

Where should the object be positioned to have a smaller and inverted image in a concave mirror?

• At the focus

• At the center of curvature

• Beyond the center of curvature

• Between the curvature and focus

Which explains why sunsets are red?

• Air molecules scatter red light more readily than others

• Red light is of shorter wavelength than other colors of light

• Red light survives the absorption of the particles in the atmosphere

• Red light is scattered the least and is transmitted the most in the atmosphere

What angle is formed by an incoming ray with the normal?

• Angle of reflection

• Angle of incidence

• Angle of refraction

• Angle of equivalence

Which explains why the sky is blue?

• Blue light is not easily scattered by the atmosphere

• Blue light is not easily absorbed by the atmosphere

• Air molecules scatter blue light more readily than other colors

• Blue light is reflected off the world's oceans into the atmosphere

Which statement best describes the 'Law of reflection'?

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

• The angle of reflection is parallel to the angle of incidence

• The angle of reflection is perpendicular to the normal.

• Both the angle of incidence and reflection lie in different planes.

Which of the following pairs perfectly describes the reflection produced by a smooth surface?

• Diffuse reflection: clear and vivid

• Specular reflection: clear and vivid

• Diffuse reflection: unclear and vague

• Specular reflection: unclear and vague