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3.2. Light
A subsection of Physics, 5054, through 3. Waves
Listing 10 of 242 questions
represents the electromagnetic spectrum. P Q R infra-red radiation radio waves X-rays visible light State the name of the component of the electromagnetic spectrum that is found in region P, Q, R. On , mark a tick (✓) in all of the boxes that represent the components with frequencies greater than the frequencies of visible light. The speed of electromagnetic radiation in a vacuum is 3.0 × 108 m / s. A television remote controller uses infra-red radiation of wavelength 9.4 × 10−7 m. Calculate the frequency of this radiation. frequency = Explain how infra-red radiation is used in television remote controllers. shows a ray of green light in air striking the side of a glass prism. green light (not to scale) The refractive index of the glass for green light is 1.5. On , 1. draw the normal for this ray, 2. mark the angle of incidence with a letter i. This angle of incidence is 57°. Calculate the angle of refraction in the glass. angle of refraction = State what happens, as the light enters the glass, to the light’s 1. frequency, 2. speed, 3. wavelength. On , draw the path taken by the light as it passes through the glass and into the air.
5054_w17_qp_21
THEORY
2017
Paper 2, Variant 1
View
A thin converging lens is made of a transparent material of refractive index 1.4. A ray of light travelling in air strikes the surface of the lens at an angle of incidence of 55°. Calculate the angle of refraction. angle of refraction = Place a tick (3) in one of the boxes in the third column of Table 8.1 to indicate how the light ray deviates and what happens to the speed of the light in the ray as it enters the lens. Table 8.1 direction of deviation speed of light away from the normal decreases away from the normal does not change away from the normal increases towards the normal decreases towards the normal does not change towards the normal increases State what happens to the frequency of the light in the ray as it enters the glass. The focal length of the lens is 2.5 cm. State what is meant by focal length. is a full-scale diagram that shows an object O of height 3.0 cm and the lens. O 1.0 cm 1.0 cm principal axis lens (full scale) By drawing on , locate and mark the image I of O. Determine the distance of I from the lens and calculate the magnification of O produced by the lens. distance = magnification = Describe how a converging lens is used in a camera.
5054_w20_qp_22
THEORY
2020
Paper 2, Variant 2
View
shows a glass lens in air and its two focal points F1 and F2. lens three rays F1 F2 Three rays of light pass through F1 to the lens. On , continue the three rays through the lens and into the air. State what happens to the speed of light on entering the glass lens from air, leaving the lens and returning to the air. Light of wavelength 6.0 × 10–7 m travels in air at a speed of 3.0 × 108 m / s. Calculate the frequency of this light. frequency = State the effect, if any, on the frequency as the light enters the glass from air.
5054_w11_qp_21
THEORY
2011
Paper 2, Variant 1
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Red light of frequency 4.7 × 1014 Hz travels in air at a speed of 3.0 × 108 m / s. Calculate the wavelength in air of this red light. wavelength = m shows a narrow beam of this red light striking the surface of a parallel-sided glass block. 45° 30° red light glass block State what happens to the speed, to the frequency and to the wavelength of the light as it enters the block. speed frequency wavelength Using the angles shown on , calculate the refractive index of the glass. refractive index = The light continues along the path shown in until it strikes the bottom surface of the block. Light then emerges into the air. Draw on to show the path taken by the light until it strikes the bottom surface and the path of the light that emerges into the air.
5054_w23_qp_21
THEORY
2023
Paper 2, Variant 1
View
Questions Discovered
242