An object placed `10 cm` in front of a lens has an image `20 cm` behind the lens. What is the power of the lens`(` in dioptres `)` ?

A focal length of a lens is 10 cm. What is power of a lens in dioptre?

An object kept 60 cm from a lens gives a virtual image 20 cm in front of the lens . What is the focal length and power of the lens ? Is it is converging lens or diverging lens ?

An object kept at 60 cm from a lens gives a virtual image at 20 cm in front of the lens. What is the focal length of the lens ? It it a converging lens or diverging lens ? Also find the magnification produced.

An object kept 60 cm from a lens gives a virtual image 20 cm in front of the lens. What is the focal length of the lens? Is it a converging lens or diverging lens?

An object is kept 60 cm from a lens gives a virtual image 20 cm in front of the lens. What is the focal length of the lens? Is is a converging lens or diverging lens?

An object kept 60 cm from a lens gives a virtual image 20 cm in front of the lens. What is the focal length of the lens? Is it a converging lens or diverging lens?