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A lens has a focal length of +20 cm. What type of lens is it?
A lens has a focal length of +20 cm. What type of lens is it?
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Q1
A lens has a focal length of +20 cm. What type of lens is it?
Concave lens
Convex lens
Bifocal lens
Cylindrical lens
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A positive focal length indicates that the lens is a convex lens, which converges light rays.
Questions & Step-by-step Solutions
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Q
Q: A lens has a focal length of +20 cm. What type of lens is it?
Solution:
A positive focal length indicates that the lens is a convex lens, which converges light rays.
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 diverge.
Step 2: Identify the sign of the focal length. A positive focal length means the lens converges light.
Step 3: Know the types of lenses. There are two main types: convex (converging) and concave (diverging).
Step 4: Conclude that since the focal length is positive (+20 cm), the lens is a convex lens.
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