Exercise: Mirrors, Geometrical Optics, Physics 10
E - 1. List 5 properties of a virtual image created by reflection from a plane mirror.

E - 2. What angle does the principal axis make with a plane mirror?

E - 3. Is the principal axis a normal to the surface of the plane mirror?

E - 4. Do the reflected rays that contribute to forming the image from a plane mirror obey the law of reflection?

E - 5. If a candle is placed 50 cm in front of a plane mirror, how far behind the plane mirror will the image be? Draw a ray diagram to show how the image is formed.

E - 6. If a stool 0,5 m high is placed 2 m in front of a plane mirror, how far behind the plane mirror will the image be and how high will the image be?

E - 7. If Susan stands 3 m in front of a plane mirror, how far from Susan will her image be located?

E - 8. Explain why ambulances have the word ‘ambulance’ reversed on the front bonnet of the car?

E - 9. Complete the diagram by filling in the missing lines to locate the image.


E - 10. An object 2 cm high is placed 4 cm in front of a plane mirror. Draw a ray diagram, showing the object, the mirror and the position of the image.

E - 11. The image of an object is located 5 cm behind a plane mirror. Draw a ray diagram, showing the image, the mirror and the position of the object.

E - 12. How high must a mirror be so that you can see your whole body in it? Does it make a difference if you change the distance you stand in front of the mirror? Explain.

E - 13. If 1-year old Tommy crawls towards a mirror at a rate of 0,3 m·s$^{−1}$, at what speed will Tommy and his image approach each other?

E - 14. Use a diagram to explain how light converges to the focal point of a concave mirror.

E - 15. Use a diagram to explain how light diverges away from the focal point of a convex mirror.

E - 16. An object 1 cm high is placed 4 cm from a concave mirror. If the focal length of the mirror is 2 cm, find the position and size of the image by means of a ray diagram. Is the image real or virtual?

E - 17. An object 2 cm high is placed 4 cm from a convex mirror. If the focal length of the mirror is 4 cm, find the position and size of the image by means of a ray diagram. Is the image real or virtual?

E - 18. Calculate the magnification for each of the mirrors in the previous two questions.

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Physics 10.VI Geometrical Optics

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