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Chapter 25: Q24CQ (page 928)
What is meant by a negative magnification? What is meant by a magnification that is less than 1in magnitude?
Negative magnificence is inverted, and the picture is usually smaller than the item.
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You can determine the index of refraction of a substance by determining its critical angle.
(a) What is the index of refraction of a substance that has a critical angle of 68.4º when submerged in water? What is the substance, based on Table 25.1?
(b) What would the critical angle be for this substance in air?
Ray tracing for a flat mirror shows that the image is located adistance behind the mirror equal to the distance of the object from themirror. This is stated,\({d_i} = - {d_o}\) since this is a negative image distance(it is a virtual image).
(a) What is the focal length of a flat mirror?
(b) What is its power?
(a) At the end of Example 25.4, it was stated that the critical angle for light going from diamond to air is 24.4º. Verify this.
(b) What is the critical angle for light going from zircon to air?
A flat mirror is neither converging nor diverging. To prove this, consider two rays originating from the same point and diverging at an angle . Show that after striking a plane mirror, the angle between their directions remains.
It can be argued that a flat mirror has an infinite focal length. If so, where does it form an image? That is, how areandrelated?
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