1. If the space between the lenses in the telescope were filled with water, whic

Question

1. If the space between the lenses in the telescope were filled with water, which of the following changes to the tube length would bring the image back into focus. ( index of refraction for glass=1.5, index of refraction for water =1.3, index of refraction for air =1)

A. increasing the tube length to compensate for the longer focal lengths of the lenses in water.

b. increasing the tube length to compensate for the increased power of each lens

c. decreasing the tube length to compensate for the decrease in focal lengths of the lenses in water.

d. decreasing the tube length to compensate for the decreased power of each lens.

Explanation / Answer

decreasing the tube length to compensate for the decrease in focal lengths of the lenses in water.

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