Question
How can you determine the focal length of a concave mirror? Of a convex mirror?
Step 1
This is to ensure that the light rays are practically parallel when they hit the mirror. Show more…
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Describe a method to measure the focal length of a concave mirror.
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Long-Answer Questions
Describe a method to measure the focal length of a convex lens.
Refraction of Light
You measure the focal length of a concave lens by first forming a real image of a light source using a convex lens. The image is formed on a screen 20 cm from the lens. You then place the concave lens halfway between the convex lens and the screen. To obtain a sharp image, you need to move the screen 15 cm further away from the lenses. How does this experiment help you determine the focal length of the concave lens? What is the focal length?
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