Chapter 5: Q18DQ (page 1151)
A spherical air bubble in water can function as a lens. Is it a converging or diverging lens? How is its focal length related to its radius?
Lens is converging. And focal length proportion to the radius of curvature.
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A concave mirror has a radius of curvature of 34.0cm. (a) What is its focal length? (b) If the mirror is immersed in water (refractive index 1.33), what is its focal length?
34.12 For a concave spherical mirror that has focal length f=+18 cm, what is the distance of an object from the mirror’s vertex if the image is real and has the same height as the object?
You may have noticed a small convex mirror next to your bank’s ATM. Why is this mirror convex, as opposed to flat or concave? What considerations determine its radius of curvature?
A student claims that she can start a fire on a sunny day using just the sun’s rays and a concave mirror. How is this done? Is the concept of image relevant? Can she do the same thing with a convex mirror? Explain.
You take a lens and mask it so that light can pass through only the bottom half of the lens. How does the image formed by the masked lens compare to the image formed before masking?
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