An echlromatic combination of lenses is formed by joining

An achromatic combination of lenses is formed by joining

An achromatic combination of lenses is formed by joining

An achromatic combination of lenses is to be made by using a convex and a concave lens. The two lenses should have

An achromatic combination of lenses produces

An achromatic doublet is formed by combining two lenses.if the focal length of the lenses and their dispersive powers are f,f^(') and omega, omega^(') respectively then

An achromatic doublet is formed by combining two lenses.if the focal length of the lenses and their dispersive powers are f,f^(') and omega omega^(') respectively then

To obtain an achromatic combination using the lenses of same material the two lenses should be :

Two lenses of power +15 and - 5D are in contact with each other forming a combination lens.(a) What is the focal length of this combination? (b) An object of size 3 cm is placed at 30 cm from this combination of lenses. Calculate the position and size of the image formed.

In which optical instruments, combination of lenses is used ?