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A person having myopic eyes uses a concave lens of focal length 50 cm. What is the power of the lens?
- a)– 2 D
- b)+ 2 D
- c)– 0.02 D
- d)+ 0.02 D
Correct answer is option 'A'. Can you explain this answer?
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A person having myopic eyes uses a concave lens of focal length 50 cm....
To determine the power of the concave lens, we need to use the formula:
Power (P) = 1 / focal length (f)
Given that the focal length of the concave lens is 50 cm, we can substitute this value into the formula to find the power.
Step 1: Identify the given values:
- Focal length (f) = 50 cm
Step 2: Use the formula to calculate the power:
Power (P) = 1 / focal length (f)
P = 1 / 50 cm
P = 0.02 D
Therefore, the power of the concave lens is 0.02 Diopters (D).
Explanation:
The power of a lens is a measure of its ability to converge or diverge light. It is defined as the reciprocal of the focal length of the lens. The unit for power is Diopters (D).
In this case, the person has myopic eyes, which means they have difficulty seeing objects in the distance. To correct this, a concave lens is used. Concave lenses are diverging lenses, which means they spread out light rays and make them appear to come from a virtual focal point. The focal length of the concave lens is given as 50 cm.
To calculate the power of the lens, we use the formula P = 1 / f, where P is the power and f is the focal length. Substituting the given value of the focal length into the formula, we find that the power of the concave lens is 0.02 D.
This means that the concave lens has a relatively low power, indicating that it only slightly diverges the light rays. The person with myopic eyes would need to wear glasses with this concave lens to correct their vision and help focus the light properly onto their retina.
Power (P) = 1 / focal length (f)
Given that the focal length of the concave lens is 50 cm, we can substitute this value into the formula to find the power.
Step 1: Identify the given values:
- Focal length (f) = 50 cm
Step 2: Use the formula to calculate the power:
Power (P) = 1 / focal length (f)
P = 1 / 50 cm
P = 0.02 D
Therefore, the power of the concave lens is 0.02 Diopters (D).
Explanation:
The power of a lens is a measure of its ability to converge or diverge light. It is defined as the reciprocal of the focal length of the lens. The unit for power is Diopters (D).
In this case, the person has myopic eyes, which means they have difficulty seeing objects in the distance. To correct this, a concave lens is used. Concave lenses are diverging lenses, which means they spread out light rays and make them appear to come from a virtual focal point. The focal length of the concave lens is given as 50 cm.
To calculate the power of the lens, we use the formula P = 1 / f, where P is the power and f is the focal length. Substituting the given value of the focal length into the formula, we find that the power of the concave lens is 0.02 D.
This means that the concave lens has a relatively low power, indicating that it only slightly diverges the light rays. The person with myopic eyes would need to wear glasses with this concave lens to correct their vision and help focus the light properly onto their retina.
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A person having myopic eyes uses a concave lens of focal length 50 cm....
A)-2D
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A person having myopic eyes uses a concave lens of focal length 50 cm. What is the power of the lens?a) 2 Db)+ 2 Dc) 0.02 Dd)+ 0.02 DCorrect answer is option 'A'. Can you explain this answer?
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