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PHY 104 Refraction Through Lenses and Optical Instruments Objective Question
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Question

A converging glass lens has a focal length of 14 cm in air. If it is immersed in water (which has an index of refraction of 1.33), how will its focal length change compared to its focal length in air?
Options
A It will decrease
B It will increase
Correct Answer
C It will remain the same
D It will become negative, making it a diverging lens
Correct Answer

Option B is the correct answer.

Detailed Explanation

The example on page 28 calculates the focal length in water to be 3.71 times its focal length in air. Therefore, the focal length will increase.

Hint

Look at the example calculation on page 28 for a lens immersed in water. The ratio fwater/fair is greater than 1.

Question Info

Course: PHY 104
Topic: Refraction Through Lenses and Optical Instruments
Type: Objective
Difficulty: Not specified
Question 91 of 947
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