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A lens has a focal length of -15 cm. What type of lens is it? (2020)
A lens has a focal length of -15 cm. What type of lens is it? (2020)
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A lens has a focal length of -15 cm. What type of lens is it? (2020)
Convex lens
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A negative focal length indicates that the lens is a concave lens.
Questions & Step-by-step Solutions
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Q
Q: A lens has a focal length of -15 cm. What type of lens is it? (2020)
Solution:
A negative focal length indicates that the lens is a concave lens.
Steps: 4
Show Steps
Step 1: Understand what focal length means. Focal length is the distance from the lens to the point where light rays converge or appear to diverge.
Step 2: Identify the sign of the focal length. In this case, the focal length is -15 cm, which is negative.
Step 3: Know the types of lenses. A lens can be either convex (positive focal length) or concave (negative focal length).
Step 4: Since the focal length is negative, it indicates that the lens is a concave lens.
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