# Sign Convention for Ray Diagram

## Trending Questions

**Q.**

What is the new Cartesian sign convention of concave and convex Lens?

**Q.**

State and explain the New Cartesian Sign Convention for spherical lenses.

**Q.**

Describe the New Cartesian Sign Convention used in optics. Draw a labelled diagram to illustrate this sign convention.

**Q.**

According to the new cartesian sign convention,

Focal length of both, convex and concave mirror is negative.

Focal length of convex mirror is positive and of concave mirror is negative.

Focal length of both, convex and concave mirror is negative.

Focal length of both, convex and concave mirror is positive

**Q.**

An object is placed at 60 cm from the pole of a concave mirror, whose focal length is 20 cm? Find the distance at which the image is formed.

v = – 20 cm

v = – 30 cm

v = + 30 cm

v = + 20 cm

**Q.**

Which type of mirror has : (a) positive focal length ? (b) negative focal length ?

**Q.**

Giving reasons, state the 'signs' (positive or negative) which can be given to the following : (a) object distance (u) for a concave mirror or convex mirror (b) image distances (v) for a concave mirror (c) image distances (v) for a convex mirror

**Q.**

What sign (+ve or -ve) has been given to the following on the basis of Cartesian Sign Convention ? (a) Height of a real image. (b) Height of a virtual image.

**Q.**

What is the nature of a mirror having a focal length of, +10 cm ?

**Q.**

An object is placed at 60 cm from the pole of a concave mirror, whose focal length is 20 cm. Find the distance at which the image is formed.

v = + 20 cm

v = – 20 cm

v = – 30 cm

v = + 30 cm

**Q.**

**Explain with diagram how a convex lens converges light rays?**

**Q.**In a concave mirror is the distance from the object to the pole is negative or positive??

**Q.**The image of a real object, placed perpendicular to the principal axis of a concave mirror, will be virtual and erect if the position of object is

(a) At centre of curvature C

(b) Between F and centre of curvature C

(c) Between pole P and focus F

Choose the correct option among the following.

- Only (a)
- Only (b)
- Only (c)
- Both (a) and (b)

**Q.**If on applying Cartesian sign convention for spherical lenses the image distance obtained is negative. State the significance of the negative sign.

**Q.**What will be the number of images formed by a lens formed by four different transparent materials?

**Q.**

According to the "New Cartesian Sign Convention" for mirrors, what sign has been given to the focal length of : (i) a concave mirror ? (ii) a convex mirror ?

**Q.**

State the sign convention to measure the distances for a lens.

**Q.**

Complete the following sentence : All the distances are measured from the

**Q.**

According to New Cartesian Sign Convention : (a) focal length of concave mirror is positive and that of convex mirror is negative (b) focal length of both concave and convex mirrors is positive (c) focal length of both concave and convex mirrors is negative (d) focal length of concave mirror is negative and that of convex mirror is positive

**Q.**

What sign (+ve or -ve) has been given to the following on the basis of Cartesian Sign Convention ? (a) Height of a real image. (b) Height of a virtual image.

**Q.**

What will be the value of focal length when object is placed at Infinity in convex mirror (positive or negative)?

**Q.**Question 3

Name the mirror that can give an erect and enlarged image of an object.

**Q.**

A ray of light falling on a lens passes through it undeviated when the

ray of light falls on the focus of the lens

ray of light falls on the optical centre of the lens

ray of light falls on the pole of the lens

ray of light falls on the centre of curvature of the lens

**Q.**

Four graphs between 1/u and 1/v are given for spherical mirrors as shown. Which one of them represents a concave mirror, as per the new cartesian sign convention?

**Q.**

Define Pole(of a curved mirror).

**Q.**

Why doesn't mirror formula has a negative sign similar to lens formula ?

**Q.**

Define focal length?

**Q.**

According to the "New Cartesian Sign Convention" for mirrors, what sign has been given to the focal length of : (i) a concave mirror ? (ii) a convex mirror ?

**Q.**According to the new Cartesian sign convention, the _______ of a curved mirror is taken at origin.

- Pole of the mirror
- Midpoint of focus and pole
- Centre of curvature
- Focus

**Q.**According to the "New Cartesian Singh Convention" for mirrors, what sign has been given to the focal length of:

(i) a concave mirror?

(ii) a convex mirror?