Question Detail

PHY 104 Refraction Through Lenses and Optical Instruments Objective Question
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Question

How is the power of a lens defined and measured?
Options
A It is the inverse of its focal length, measured in meters (m).
B It is the inverse of its focal length, measured in diopters (D).
Correct Answer
C It is equal to its focal length, measured in joules (J).
D It is the square of its focal length, measured in watts (W).
Correct Answer

Option B is the correct answer.

Detailed Explanation

Page 7 states: 'The power of a lens is the inverse of its focal length: P = 1/f. Lens power is measured in diopters, D: 1 D = 1 m⁻¹.'

Hint

Refer to the definition and units of lens power on page 7 of the document.

Question Info

Course: PHY 104
Topic: Refraction Through Lenses and Optical Instruments
Type: Objective
Difficulty: Not specified
Question 76 of 947
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