What is the focal length of a lens that produces a real image 3 times as large as the object if the distance between image and object is 1m?

What is the focal length of a lens that produces a real image three times as large as the object if the distance between image and object is 1.0m? Ans: 18.75 cm.

What is the focal length of a lens that forms an inverted image the same size as the object when the object is located 20 cm in front of the lens?

An inverted, real and same size image of an object, is formed by a convex lens when the object is placed at 2f i.e. u = 2f1. (a) When the object is at 2f1 in a convex lens then the image is formed at 2f2. Hence, position of the image is 60 cm behind the lens.

What should be the distance of an object from a convex lens of focal length 10cm?

The distance at which an object should be placed from a thin convex lens of focal length 10 cm to obtain a virtual image of double of its size is. 5.5 cm.

How do you find the focal length of a lens?

The focal length of a double convex lens is given by the formula (1/v) + (1/u) = (1/f), where u is the distance between the object and the lens, v is the distance between the image and the lens.

What is distance between objective and eye lens of telescope in normal adjustment?

The magnifying power of an artronomical telescope in normal adjustment is 100 and distance between objective and eye lens in 101cm.

What is the focal length of a lens?

The focal length of a lens is determined when the lens is focused at infinity. Lens focal length tells us the angle of view—how much of the scene will be captured—and the magnification—how large individual elements will be. The longer the focal length, the narrower the angle of view and the higher the magnification.

How do you find the focal length of a concave mirror?

By obtaining the Real image of a distant object at its focus, the focal length of the concave mirror can be estimated as shown in the diagram. The focal length of the convex mirror is positive, whereas that of the concave mirror is negative. The same can also be proved by using the mirror formula: (1/f = 1/v +1/u).

What should be the distance of an object from a convex lens of focal length 10cm so as to obtain an image twice the size of the object?

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. Therefore, object should be placed at a distance of 5 cm from the lens.

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

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 is the focal length of the lens?

What is the length of the telescope in a normal adjustment?

For a telescope in normal adjustment, the length of telescope is found to be 27 cm.

What does 2 times the focal length of a lens mean?

The special case: when an object is located at a distance of exactly 2 times the focal length of a lens, the image is located at 2 times the focal length (but on the other side), and equal object and image distances mean equal size.

What is the distance of the object formed by a lens?

A real image of an object formed by a converging lens of a focal length of 15cm is three times the of the object. What is the distance of the object from the lenses? The lens formula is 1 v − 1 u = 1 f where v, u and f are the distance of the image from the mirror , the distance of the object from the mirror and the focal length respectively.

What is the distance between the object and the image?

So, the 60 cm distance between object and image is made up of 2X the lens focal length plus another 2X the focal length, plus the distance between the front and rear principal planes of the lens.

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.