What is the focal length of the lens that produces a real image 3 times?

Therefore, f=3u/4 = -3* -25/4 = 18.75cm.

Where should the object before a convex lens of focal length 10 cm be placed to get a virtual image at a distance of 30cm?

Answer: Explanation: In a convex lens virtual image is formed when the object is placed between pole and focus of the lens . So to obtain a virtual image at a distance of 30 cm from the lens the object must be placed between pole and focus of the lens.

What should the distance of an object from a convex lens?

Minimum distance between an object and itsreal image produced by a convex lens is 4f(f is focal length of convex lens)

When a telescope is in normal adjustment the distance between the object lens and the eye lens is equal to the sum of their focal length?

In normal adjustment of telescope distance between objective and eyepiece is equal to sum of respective focal lengths.

At what distance from a convex lens of focal length 10 cm must an object be placed in order that an image may be formed two times the size of the object hint take m 2?

Calculate the distance at which an object should be placed in front of a convex lens of focal length 10 cm to obtain a virtual image of double its size. Here, u=?,f=10cm,m=+2, as image is virtual. Therefore, object should be placed at a distance of 5 cm from the lens.

What is the value of power of lens whose focal length is 10 cm?

Thus, the powerof this convex lens is +10 dioptres which is also written as +10D. The plus sign with the power indicates that it is converging lens or convex lens.

What does a convex lens of focal length 10 cm produce?

A convex lens of focal length 10 cm produces a real image that is 3 times the size of an object. What will be the distance of the object from the lens? (where m is the magnification , u is the position of object , v is the position of image.)

How do you find the distance of a convex lens?

Therefore, object distance = u = (-20) cm. Object is to the left side of the lens. And, image distance = v = (+2 * 20) cm = (+40) cm. Image is to the right side of the lens. Focal length of the lens = (+13.33) cm, positive value of f confirmimg the lens is indeed a convex one.

What is the focal length of a 6-cm high object?

A 6-cm high object is placed 6 cm from an 18-cm focal length. Find out the image distance, the magnification of the image, the image height and the properties of the image. The focal length is positive that is a convex lens.

Can convex lenses be used to produce a real image?

A convex lens can be used to produce a real image, and this occurs if the object is located at a position of more than one focal length from the lens. It is projected in front of the lens and can be captured on a screen.

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