Wednesday
March 22, 2017

Post a New Question

Posted by on Tuesday, March 19, 2013 at 1:33pm.

A slide is 5 inches high. it is placed 5.5 inches from the convex lens of a porjection lantern. The image is cast upon a screen 55 inches away. the focal length of the lens is ______inches?
b) the heigh of the image cast by the lens is ________inches?

  • physics - , Tuesday, March 19, 2013 at 1:44pm

    (a) Use the lens formula.
    1/5.5 + 1/55 = 1/f
    Solve for the focal length, f.
    10/55 + 1/55 = 11/55 = 1/5 = 1/f
    One more step.

    (b) image height = (object height)x(55/5.5)
    = 5*10 = ___ inches

Answer This Question

First Name:
School Subject:
Answer:

Related Questions

More Related Questions

Post a New Question