A lens that is curved inwards at the center on both sides so that the lens has greater thickness at its edges is called
a) a convex lens.
b) a refracting lens.
c) a converging lens.
d) a concave lens.
d
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A teacher sends her students on a treasure hunt. She gives the following instructions: 1. Walk 300 m north 2. Walk 400 m northwest 3. Walk 700 m east-southeast and the treasure is buried there
As all the other students walk off following the instructions, Jane physics student quickly adds the displacements and walks in a straight line to find the treasure. How far and in what direction does Jane need to walk? A) 187 m in a direction 67.3° north of east B) 481 m in a direction 40.9° north of east C) 399 m in a direction 52.5° north of east D) 284 m in a direction 28.2° west of north E) The treasure position cannot be reached in one straight walk.
A 10-inch telescope (25.4 cm in diameter) is used to determine if what appears to be one star is actually two stars. Stars are so far away that they are essentially point sources
How close (in angle) can the two stars be and still be resolved by this telescope if it is focusing light of wavelength of 550 nm? (Consider only the limitation due to diffraction.) A) 4.2 × 10-8 degree B) 2.6 × 10-6 degree C) 3.0 × 10-4 degree D) 1.5 × 10-4 degree E) 6.6 × 10-8 degree
What's wrong with the statement "heat rises?"
a. Nothing—heat does rise. b. One should say "energy rises.". c. One should say "heated air (or other fluid) rises.". d. none of the above
If switch A is closed in the figure below, what happens to the impedance of the circuit?