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Rectilinear propagation of light questions and answers
Explain why the image formed in a pinhole camera gets blurred when the hole is enlarged.
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1.
What property of light is suggested by the formation of shadows?
2.
A vertical object placed on a bench is observed to have three shadows of different sharpness, in different directions. Explain this observation.
3.
What is meant by virtual image?
4.
Figure 6 shows a ray of light incident on plane mirror at point O. The mirror is rotated clockwise through an angle #30^0# about an axis perpendicular to the paper. Determine the angle through which the reflected ray rotated.
5.
Figure 5 shows an object 0 placed in front of a plane mirror. On the same diagram, draw rays to locate the position of the image I, as seen from the eye, E.
6.
Figure 6 shows an object O being viewed using two inclined mirrors M1 and M2. Complete the diagram by sketching rays to show the position of the image as seen by the eye E.
7.
Figure 6 shows a ray of light being reflected from a mirror. What is the angle of reflection?
8.
Figure 5 shows two mirrors inclined at an angle of #60^0# to each other. A ray of light isshown incident on one of the mirrors. Sketch on the same diagram, the path of the ray until it leaves the two mirrors. Indicate the angles at each reflection.
9.
(i) In the space provided below, sketch a labeled diagram to show how pinhole camera forms an image of a vertical object placed in front of the pinhole. (ii) A building standing 200m from a pinhole camera produces on the screen of the camera an image 2.5cm high 5.0cm behind the pinhole. Determine the actual height of the building.
10.
Figure 5 shows an arrangement of a source of light, an opaque object and a screen. Using A, B and C as point sources, sketch on the same figure labeled ray diagram to show what is observed on the screen.
11.
In a certain pinhole camera, the screen is 10cm from the pinhole. When the camera is placed 6m away from a tree, a sharp image of the tree 16cm high is formed on the screen. Determine the height of the tree.
12.
Figure 1 represents a pinhole camera. Sketch, rays to show the formation of an enlarged image in the camera. Label both the object and the image.
13.
Figure 1 shows three point sources of light with an opaque object placed between them and the screen. Explain the nature of the shadow formed along B and C.
14.
State the number of images formed when an object is between two plane mirrors placed in parallel.
15.
Figure 1 shows a ray until of light incident on a mirror at an angle of #45^0#. Another mirror is placed at an angle of #45^0# to the first one as shown. Sketch the path of the ray until it emerges.
16.
Figure 1 shows an object placed in front of a plane mirror. Sketch the image of the object as seen in the mirror.
17.
Figure 1 shows a mirror XY placed equidistant from two parallel lines AB and PT. Four students stand at in front of the mirror. (a) Indicate the position of the images of students at QR and T on the line AB. (b) State which of the three images are visible to the student standing at P. (c) Using rays to indicate on the figure, how (b) above is possible.
18.
Figure 2 shows two mirrors PQ and QR inclined at an angle of #110^0#. A ray of light is incident on mirror PQ at an angle of #60^0#. Complete the diagram to determine the angle of reflection of the ray in the mirror QR.
19.
State the reason why when a ray of light strikes a mirror at #90^0#, the reflected ray travels along the same path as the incident ray.
20.
Explain why the image formed in a pinhole camera gets blurred when the hole is enlarged.
21.
Draw a ray diagram to show the formation of a partially dark shadow and a totally dark shadow during the eclipse of the sun.
22.
Figure 1 shows three mirrors arranged at right angles to each other. A ray of light is incident on one of the mirrors. Complete the diagram to show the path of the ray after reflection on each of the mirrors.
23.
Figure 1 shows a ray of light incident on a mirror at an angle of #45^0#. Another mirror is placed at an angle of #45^0# to the first one as shown. Sketch the path of the ray until it emerges.
24.
State what happens to the image formed by a pinhole camera when the size of the hole is increased?
25.
Figure 1 shows two plane mirrors inclined at an angle of #120^0# to each other. A ray of light makes an angle of #40^0# with the first mirror. By completing the ray diagram, determine the angle of reflection on the second mirror.
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