A driver sets out on a journey. for the first half of the distance she drives at the leisurely pace of 30 mi/h; during the secon
1 answer:
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Answer:
<em>108</em>
Explanation:
<u>Proportions </u>
Two quantities are proportional when one of them can be obtained by multiplying or dividing the other by a constant value. For example, knowing the price of one pencil as p, we can know the cost of purchasing X pencils as C=p.X
We are required to increase 90 by the ratio 6:5. The new value will be proportional to the original because we'll compute the product of
So the new value is 108
Answer:
<h2>36cm from the surface</h2>Explanation:
Equation of refraction of a lens is expression according to the formula given below;
R is the radius of curvature of the convex refracting surface = 12cm
v is the image distance from the refracting surface
u is the object distance from the refracting surface
n₁ and n₂ are the refractive indices of air and the medium respectively
Given parameters
R = 12 cm
u = (since light incident is parallel to the axis)
n₁ = 1
n₂ = 1.5
Required
<em>focus point of the light that is incident and parallel to the central axis (v)</em>
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Substituting this values into the given formula we will have;
Cross multiply
Hence Light incident parallel to the central axis is focused at a point 36cm from the surface