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2 cards from this section. Quick, good the night before a test.
What is the main difference between convex and concave lenses?
Think about their shape and how they handle light.
What is the formula for magnification?
Consider height and distances.
What type of lens converges light?
Remember: Convex lenses are thicker in the middle.
True or False: Concave lenses can form real images.
Think about how they diverge light.
A convex lens has a focal length of 30 cm. An object is placed 60 cm away from it. Calculate the image distance and describe the image.
Don’t forget sign conventions in your calculations!
If a concave lens produces a virtual image at a distance of -20 cm when an object is placed at -10 cm, calculate the focal length.
Remember to pay attention to signs for the distances.
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