Optics Answers

A piece of iron placed on a block of wood makes it float lower in the water, If the iron were instead suspended beneath the wood, would it float as low, lower, or higher? Defend your answer.

If a piece of photographic film is placed at the location of a real image, the film will record

the image. Can this be done with a virtual image? How might one record a virtual image?

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?

When a T. rex pursues a jeep in the movie Jurassic Park, we see a reflected image of the T. rex via a side-view mirror, on which is printed the (then darkly humorous) warning: “Objects in mirror are closer than they appear.” Is the mirror flat, convex, or concave?

A penguin waddles along the central axis of a concave mirror, from the focal point to an effectively infinite distance.(a) How does its image move?(b) Does the height of its image increase continuously, decrease continuously, or change in some more complicated manner?

a man 1.30 m tall stands 5.20 m from a concave mirror. if the image could be formed on a screen 15, what is the size of the images?

A student is only able to read the lecture notebook when it is held at 65.00cm from his eyes. What focal length and power must the lenses of his reading glasses have to bring his near point to the normal value

A light ray travelling from glass to air undergoes refraction. Calculate the angle of refraction to the nearest whole number if the incidence angle is 30° and the refractive for air and glass are 1.0 and 1.5 respectively.

A compound microscope consists of objective and eye piece lens of focal length 0.50cm and 1.00cm respectively. An object is placed 0.55cm from the objective lens and the final image is formed at infinity. Calculate the magnifying power of the glass and the tube L.

You can’t see clearly underwater with the naked eye, but you can if you wear a face mask or goggles (with air between your eyes and the mask or goggles). Why is there a difference? Could you instead wear eyeglasses (with water between your eyes and the eyeglasses) in order to see underwater? If so, should the lenses be converging or diverging? Explain.