The image of the needle placed `10 cm` from a lens is formed on a wall `20 cm` on the other side of the lens. Find focal length of the lens and size of image formed, if the size of object needle is `2.5 cm`.

The image of a needle placed 45 cm from a lens is formed on a screen placed 90 cm on the other side of lens. Find displacement of image if object is moved 5 cm away from lens.

The image of a needle placed 45 cm from a lens is formed on a screen placed 90 cm on the other side of lens. Find displacement of image if object is moved 5 cm away from lens.

A candle placed 25 cm from a lens forms an image on a screen placed 75 cm on the other side of the lens. The focal length and type of the lens should be

The image of needle placed 45 cm from a lens is formed on a screen placed 90 cm on the otehr side of teh lens.Find the displacement of the image,if the object is moved to 5.0 cm away from the lens.

An object placed at 20 cm from a lens, forms an image on a screen placed 60 cm on the other side of the lens. What is the focal length and type of the lens ?

A needle placed at 30 cm from the lens forms an image on a screen placed 60 cm on the other side of the lens. Identify the type of lens and determine the focal length.

A needle of height 5 cm placed 45 cm from a lens forms an image on a screen placed 90 cm on the other side of the lens the type of lens and its focal length are

A needle placed 45 cm from a lens forms an image on a screen placed 90 cm on other side of the lens. Identify the type of lens and determine its focal length, What is the size of the image, if the size of the needle is 5 cm?