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The ƒ number of a camera lens is 4.5. Which of the following statements is correct ?
- a) The focal length of lens is 4.5 cm
- b) It is reciprocal of the focal length expressed in meters
- c) The aperture of the lens is 4.5 cm
- d) The ratio of focal length to the aperture is 4.5
Correct answer is option `D`. Can you explain this answer?
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The ƒ number of a camera lens is 4.5. Which of the following statement...
In optics, the f-number of an optical system such as a camera lens is the ratio of the system's focal length to the diameter of the entrance pupil ("clear aperture").[1][2][3] It is also known as the focal ratio, f-ratio, or f-stop.
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The ratio of focal length to the aperture of the lens is called the f-number of the camera.
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The ƒ number of a camera lens is 4.5. Which of the following statement...
The ƒ number of a camera lens is 4.5. Which of the following statements is correct?
The correct statement is option D: The ratio of focal length to the aperture is 4.5.
Explanation:
To understand why option D is correct, let's first define the ƒ number and understand its significance in photography.
The ƒ number, also known as the f-stop or aperture ratio, is a numerical value that represents the relative aperture size of a camera lens. It is calculated by dividing the focal length of the lens by the diameter of the lens opening, also known as the aperture. The ƒ number is denoted by ƒ/N, where N represents the aperture diameter.
Now let's analyze each option to determine the correct statement.
a) The focal length of the lens is 4.5 cm:
The focal length of a lens is a separate measurement that represents the distance between the lens and the image sensor when the subject is in focus. The ƒ number does not directly indicate the focal length, so option A is incorrect.
b) It is reciprocal of the focal length expressed in meters:
The reciprocal of the focal length expressed in meters would be 1/focal length. Since the ƒ number is not directly related to the focal length, option B is incorrect.
c) The aperture of the lens is 4.5 cm:
The ƒ number represents the ratio of the focal length to the aperture, but it does not directly indicate the actual size of the aperture. Option C is incorrect.
d) The ratio of focal length to the aperture is 4.5:
This statement is correct. As mentioned earlier, the ƒ number is calculated by dividing the focal length of the lens by the diameter of the aperture. Therefore, the ratio of the focal length to the aperture is indeed 4.5.
In conclusion, the correct statement is option D: The ratio of focal length to the aperture is 4.5.
The correct statement is option D: The ratio of focal length to the aperture is 4.5.
Explanation:
To understand why option D is correct, let's first define the ƒ number and understand its significance in photography.
The ƒ number, also known as the f-stop or aperture ratio, is a numerical value that represents the relative aperture size of a camera lens. It is calculated by dividing the focal length of the lens by the diameter of the lens opening, also known as the aperture. The ƒ number is denoted by ƒ/N, where N represents the aperture diameter.
Now let's analyze each option to determine the correct statement.
a) The focal length of the lens is 4.5 cm:
The focal length of a lens is a separate measurement that represents the distance between the lens and the image sensor when the subject is in focus. The ƒ number does not directly indicate the focal length, so option A is incorrect.
b) It is reciprocal of the focal length expressed in meters:
The reciprocal of the focal length expressed in meters would be 1/focal length. Since the ƒ number is not directly related to the focal length, option B is incorrect.
c) The aperture of the lens is 4.5 cm:
The ƒ number represents the ratio of the focal length to the aperture, but it does not directly indicate the actual size of the aperture. Option C is incorrect.
d) The ratio of focal length to the aperture is 4.5:
This statement is correct. As mentioned earlier, the ƒ number is calculated by dividing the focal length of the lens by the diameter of the aperture. Therefore, the ratio of the focal length to the aperture is indeed 4.5.
In conclusion, the correct statement is option D: The ratio of focal length to the aperture is 4.5.
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The ƒ number of a camera lens is 4.5. Which of the following statements is correct ?a) The focal length of lens is 4.5 cmb) It is reciprocal of the focal length expressed in metersc) The aperture of the lens is 4.5 cmd) The ratio of focal length to the aperture is 4.5Correct answer is option `D`. Can you explain this answer?
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The ƒ number of a camera lens is 4.5. Which of the following statements is correct ?a) The focal length of lens is 4.5 cmb) It is reciprocal of the focal length expressed in metersc) The aperture of the lens is 4.5 cmd) The ratio of focal length to the aperture is 4.5Correct answer is option `D`. Can you explain this answer? for NEET 2024 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about The ƒ number of a camera lens is 4.5. Which of the following statements is correct ?a) The focal length of lens is 4.5 cmb) It is reciprocal of the focal length expressed in metersc) The aperture of the lens is 4.5 cmd) The ratio of focal length to the aperture is 4.5Correct answer is option `D`. Can you explain this answer? covers all topics & solutions for NEET 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The ƒ number of a camera lens is 4.5. Which of the following statements is correct ?a) The focal length of lens is 4.5 cmb) It is reciprocal of the focal length expressed in metersc) The aperture of the lens is 4.5 cmd) The ratio of focal length to the aperture is 4.5Correct answer is option `D`. Can you explain this answer?.
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