An incident ray through the focal point of a spherical mirror will: reflect through the center of curvature. reflect back through the focal point. reflect parallel to the principle axis. reflect the same direction as the incident ray.

option (c)

Explanation:

There are the rules to draw the ray diagrams for a mirror.

1. If a ray is incident on a spherical mirror parallel to the principal axis, then after reflection it passes through the focus of the mirror.

2. If a ray is incident on the spherical mirror passing through the focus, then after reflection it becomes parallel to the principal axis.

3. If a ray is incident on the spherical mirror passes through the centre of curvature then after reflection is retraces its path.

So, is an incident ray passes through the focal point of the spherical mirror, then it reflect parallel to the principal axis.

  the grams     of oxygen gas   that can be produced     is 20.6   grams of o₂

calculation

2liclo₃ →   2 licl + 3 o₂

step 1:   find the moles of liclo₃

moles = mass÷ molar mass

from periodic table the molar mass of liclo₃ =6.9 +35.5   +(16 x3) =90.4 g/mol

moles=38.7 g÷90.4 g/mol=0.4281   moles

step 2:   use the   mole ratio   to calculate the moles of o2

from equation above, liclo₃: o₂   is 2: 3  

therefore the moles of   o₂=0.4281 moles x3/2 =0.6422   moles

step 3: find mass   of o₂

mass= moles x molar mass

from periodic table the   molar mass of   o₂ = 16 x2= 32 g/mol

mass=0.6422   moles   x   32 g/mol = 20.6 grams of o₂

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