# What is the focal length of the convex lens? ​

• 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

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

Explanation:

We are asked to get the focal length of the convex mirror. We can do this using the mirror equation:

.

In this particular problem

(distance of the image)

(distance of the object)

note that we used the sign convention for this particular equation.

is negative (-) if the image is formed behind the mirror.

Now, substituting the values that we have, we get:

.

.

.

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
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What is the focal length of the convex lens? ​...