Camera lenses are described in terms of their focal length. A 50 mm lens has a focal length
of 50 mm. A camera is focused on an object
75 m away using a 380 mm lens.
Locate the position of the image.
Answer in units of mm.

Lin yao looks at the back of a spoon. how should she describe her reflection? upside down and smaller upside down and larger right-side up and smaller right-side up and larger

During the experiment if you could triple the breakaway magnetic force with all other quantities left unchanged, what is the new value for the critical velocity if it was v0 (initial velocity), initially? (b) now if you halved the radius with all other quantities left unchanged, what is the new critical velocity if it was v0 (initial velocity), initially? (c) if during the experiment, critical velocity quadrupled with all other quantities left unchanged, what is the new breakaway force if its magnitude was initially f0,?

What is the role of lenses in microscopy?