## What is the power of a concave lens of focal length 15 cm?

therefore the power of the lens is 0.067.

## How far should the object be placed from a concave lens of focal length 15cm which forms an image 10cm from the lens?

30 cm away

How far is the object placed from the lens? Draw the ray diagram. So, the object is placed 30 cm away from the concave lens.

**At what distance an object must be placed from a lens of focal length 15 cm?**

Thus the object should be placed at a distance of 30 cm from the lens on the left side.

**What is the distance from a convex lens of focal length 15cm?**

A convex lens of focal length 15 cm produces a virtual image at a distance of 30 cm from the lens.

### What is the power of lens if its focal length is 50 cm?

= 100/50 = 2 dioptre. The SI unit of power is dioptre.

### What is the power of a concave lens of focal length 10 cm?

The focal point is located on the principal axis. 1 dioptre is the unit for power of a lens whose focal length is 1 meter. Power of a lens=? Hence, the power of the lens is 10 dioptre.

**How do you find the focal length of a concave lens?**

You can calculate the focal length of the concave lens using the formula f2 = (f1F/(f1-F).

**Which lens is concave?**

Lenses may be divided broadly into two main types: convex and concave. Lenses that are thicker at their centers than at their edges are convex, while those that are thicker around their edges are concave. A light beam passing through a convex lens is focused by the lens on a point on the other side of the lens.

#### What is the magnification of concave lens?

Concave lenses always form virtual images, so magnification produced by a concave lens is always positive. A concave lens always forms the image smaller than the object, so |m|<1.

#### What will be the power of a convex lens whose focal length is 50 cm?

Power of a lens is always reciprocal to the focal length. So, aconvex lens with 50cm focal length has a power of (1/0.5) Dioptre(D) or 2D. Since, a convex lens is a converging lens, thepower of the convex lens is +2D………

**What is the power of a lens of focal length cm?**

1 dioptre is the unit for power of a lens whose focal length is 1 meter. Power of a lens=? Hence, the power of the lens is 10 dioptre.

**What is the focal length of a concave lens?**

Example 10.3 – A concave lens has focal length of 15 cm. At what A concave lens has focal length of 15 cm. At what distance should the object from the lens be placed so that it forms an image at 10 cm from the lens? Also, find the magnification produced by the lens.

## How big is the concave lens in NCERT?

A concave lens of focal length 15 cm forms an image 10 cm from the lens. How far is the object placed from the lens? Draw the ray diagram. NCERT Question 11 A concave lens of focal length 15 cm forms an image 10 cm from the lens.

## How far is the object placed from the lens?

A concave lens of focal length 15 cm forms an image 10 cm from the lens. How far is the object placed from the lens? Draw the ray diagram. So, the object is placed 30 cm away from the concave lens. Was this answer helpful?

**How to draw ray diagram with concave lens?**

Draw the ray diagram. A concave lens of focal length 15 cm forms an image 10 cm from the lens. How far is the object placed from the lens? Draw the ray diagram. So, the object is placed 30 cm away from the concave lens.