What is the focal length of the convex lens?

Answers

Réponse publiée par: reyquicoy4321
For convex lens the focal length is positive. On the other hand, the focal length of concave lens is negative. Thus, for convex lens, the focal length is a distance over which all the parallel rays will converge. A certain point over that distance all the parallel rays will converge, that point is known as focal point.
Explanation:
Réponse publiée par: reyquicoy4321
answer:
THE ANSWER IS D.
Explanation:
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Réponse publiée par: tayis
Focal length (shown in red) is the distance between the center of a convex lens or a concave mirror and the focal point of the lens or mirror — the point where parallel rays of light meet, or converge.
Réponse publiée par: nelspas422
Focal length is the distance between the center of a convex lens or a concave mirror and the focal point of the lens or mirror the point where parallel rays of light meet.
Réponse publiée par: JUMAIRAHtheOTAKU
The answer is 33 cm.
Explanation:
We are asked to get the focal length of the convex mirror. We can do this using the mirror equation:
$\frac{1}{f}=\frac{1}{d_{o}}+\frac{1}{d_{i}}$ .
In this particular problem
${d_{i}} = -15 cm$ (distance of the image)
${d_{o}} = 27.5 cm$ (distance of the object)
note that we used the sign convention for this particular equation.
${d_{i}}$ is negative (-) if the image is formed behind the mirror.
Now, substituting the values that we have, we get:
$\frac{1}{f}=\frac{1}{d_{o}}+\frac{1}{d_{i}}$ .
$\frac{1}{f}=\frac{1}{27.5 cm}+\frac{1}{-15 cm}$ .
$\frac{1}{f}=-\frac{1}{33 cm}$ .
The sign just signifies that it is, in fact, a convex mirror.
Therefore, the focal length of the convex mirror used is 33 cm.
I hope this helps.
Réponse publiée par: kirbydimaranan
The focal length of convex lens is positive