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What is the focal length of a concave lens with a focal point at -15 cm?
Practice Questions
Q1
What is the focal length of a concave lens with a focal point at -15 cm?
15 cm
-15 cm
30 cm
-30 cm
Questions & Step-by-Step Solutions
What is the focal length of a concave lens with a focal point at -15 cm?
Correct Answer: -15 cm
Steps
Concepts
Step 1: Understand that a concave lens is a type of lens that diverges light rays.
Step 2: Know that the focal point of a lens is where light rays either converge or appear to diverge from.
Step 3: Remember that for concave lenses, the focal length is always considered negative.
Step 4: Since the focal point is given as -15 cm, this means the focal length is also -15 cm.
No concepts available.
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