Christie bought a 9 x 50 pair of binoculars for stellar observing. The 9 is the
A) f/number.
B) aperture in cm.
C) angular magnification.
D) aperture in mm.
E) f/number-1
C
You might also like to view...
The present motions of the planets were inherited from the rotation of the solar nebula
a. True b. False Indicate whether the statement is true or false
Diffraction Gratings: A metallic sheet has a large number of parallel slits, 5.0 mm wide and 20 cm apart. This sheet is used as a diffraction grating for microwaves. A wide parallel beam of microwaves is incident normally on the sheet. What is the smallest microwave frequency for which only the central maximum will occur? (c = 3.00 × 108 m/s)
A. 0.50 GHz B. 0.70 GHz C. 1.0 GHz D. 1.5 GHz E. 2.0 GHz
Six identical blocks of steel, each with mass 10.0 kg, are taken to the Moon. On the Moon, their combined mass is
A. 60.0 kg. B. zero. C. 10.0 kg. D. 360 kg.
A camera with a 50.0 mm lens is designed to focus from 1.00 m to infinity. What is the distance of travel of the lens with respect to the film plane over this range of focus?
A. 50.0 mm B. 52.6 mm C. 47.4 mm D. 5.30 mm E. 2.60 mm