3.2.3. Thin lenses
A subsection of Physics, 5054, through 3. Waves
Listing 10 of 79 questions
shows the path of a ray of blue light as it passes through a glass prism. 61° 29° 45° A B air glass 45° State the wave term used to describe what happens to the ray of light at A. Using angles from , calculate the refractive index of the glass. refractive index = Explain why the ray does not emerge from the prism at B. shows a second, horizontal, ray of blue light striking the prism at point C. On , continue the path of the second ray through and out of the glass prism. C A B The camera lens shown in is used to photograph the object O. O camera lens (full scale) The object O is 2.0 cm high and is placed 8.0 cm from the centre of the lens. The lens has a focal length of 3.0 cm. Draw rays on to find the position and height of the image formed by the lens. Label the image I. Determine the height of the image. The image formed by the lens is a real image. 1. Explain the difference between a real image and a virtual image. 2. Explain how a converging lens is used to produce and view a virtual image.
5054_s12_qp_21
THEORY
2012
Paper 2, Variant 1
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A collector views a postage stamp of height 1.5 cm through a lens. The lens is 2.0 cm from the stamp. The image has a linear magnification of 3.0. The stamp, the image of the stamp and the position of the lens are shown full scale in . position of lens stamp 1 cm image viewed from this side of the lens image of stamp (full scale) A ray of light from the top of the stamp to the lens is shown on . State the type of lens used. State what is meant by linear magnification. On , complete the path of the ray from the top of the stamp after it passes through the lens. Use your drawing to determine the focal length of the lens. On , draw two additional rays from the top of the stamp to show how the image is formed.
5054_s14_qp_21
THEORY
2014
Paper 2, Variant 1
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shows a converging lens, an object O and the image I produced by the lens. lens O lens I O 1 cm I The image formed is real and has a linear magnification of 4.0. Define the term linear magnification. Explain what is meant by real image. On a horizontal ray has been drawn from the top of the object to the lens. Continue this ray until it meets the image. Using , determine the focal length of the lens. focal length = Draw another two rays from the top of the object to show how the image is formed.
5054_s17_qp_21
THEORY
2017
Paper 2, Variant 1
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The virtual reality headset in contains a display and a lens, as shown in . display virtual reality headset display lens eye (not to scale) The display is the object for the lens. The lens acts as a magnifying glass and forms a virtual image of the display. Describe where the display must be positioned relative to the focal length of the lens for the lens to act as a magnifying glass for the image on the display. Explain how a virtual image is formed. An arrow on the display is 3.4 cm from the lens. The virtual image of the arrow is 22 cm from the lens. shows the arrow O, the lens L and the virtual image of the arrow I, drawn on a grid with a scale of 1:2. I O L 2 cm 2 cm (scale: 1 cm represents 2 cm) On , draw a ray diagram to show the formation of the virtual image I. Determine the focal length of the lens. focal length = cm
5054_s23_qp_21
THEORY
2023
Paper 2, Variant 1
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Questions Discovered
79