If a lens is immersed in water, its focal length changes, as discussed in Conceptual Example 26-17.
Question:
(a) If a spherical mirror is immersed in water, does its focal length increase, decrease, or stay the same?
(b) Choose the best explanation from among the following:
I. The focal length will increase because the water will cause more bending of light.
II. Water will refract the light. This, combined with the reflection due to the mirror, will result in a decreased focal length.
III. The focal length stays the same because it depends on the fact that the angle of incidence is equal to the angle of reflection for a mirror. This is unaffected by the presence of the water.
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Picture the Problem A mirror is immersed in water and its focal length is measured Strategy Consider ...View the full answer
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