Which of the following is correct formula for mirror?

The SI unit of power of a lens is:

Which one of the following materials cannot be used to make a lens?

Which of the following is true for law of reflection?

Which of the following mirror used in the headlight of a car?

The power of a lens is directly proportional to:

No matter how far you stand from a mirror, your image appears erect. Which is mirror likely to be.

If the focal length of lens is 20 cm, then power of lens will be:

If the power of lens is negative then lens will be:

Which of the following is correct for lens formula?

Which of the following is correct for magnification (m) of lens?

If you are given refractive index of alcohol 1.36, benzene 1.50, kerosene 1.44 and turpentine is 1.47. Then in which of these does light travel fastest?

If the focal length of the lens is negative then nature of lens will be:

One dioptre is equal to:

If the object distance 5 cm and image distance is 100 cm, then what will be the magnification of lens?