What happens when light rays incident on a convex mirror run parallel to its principal axis?
a. the reflected rays go parallel to the vertex.
b. the reflected rays pass through the focal point.
c. the reflected rays pass through the center of curvature.
d. the reflected rays go parallel to the focal point.

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b. The reflected rays appear pass through the focal point.

Explanation:

A convex mirror has a glass bulging outwards. A convex mirror is a divergent mirror. Light rays incident on a convex mirror  parallel to its principal axis after reflection appear to diverge from the focal point. convex mirrors can not be used to focus light.

Thus, the correct option is b.

  1.the balanced   chemical equation is as below

cu +   2 ag(no)₃ → cu(no₃)₂   +2 ag

2.the   much silver   produced   is   50.9 g

step 1: find the   moles of cu

moles =   mass÷   molar mass

  from periodic table the molar mass of cu = 63.5 g/mol

moles is therefore = 15.00 g÷ 63.5 g/mol = 0.236   moles

step 2: use the mole ratio to determine the   moles of ag

from equation above   cu: ag   is 1: 2

therefore the moles of ag   =0.236   moles   x 2/1 =0.472   moles

step 3: find the mass   of ag

mass = moles x molar mass

from periodic table   the molar mass of ag =107.87 g/mol

mass   = 0.472   moles x 107.87 g/mol = 50.9 g

3.   the   much   silver   collected worth is   1.797 oz

  convert   50.9 g   to oz

that is   1 gram = 0.0353 oz

          50.9 grams =?   oz

by cross multiplication

={(50.9 grams x 0.0353 oz) / 1   gram}   =1.797 oz