Thin lens (Part-2)|Power of lens| combination of lens| silvered lens

Power Of Combination Of Lens

The power of a converging lens is 4.5 D and that of a diverging lens is 3 D. The power of this combination of lenses placed close together is:

Thin lens (Part-1) |Types of thin lens|Nature of lens|Lens displacememt method

Image Formation From Concave Lens|Questions|Power Of Lens|Combination Of Lens|Questions

Examples on lens and combination OF lens and mirror

(i) A convex lens of power +6D and a concave lens of power -4D are combined together. Find the power of the combination of two lenses.

The focal length of the combination of two thin lenses in contact is 80 cm. If the focal length of one lens is -20 cm, what is the power of the other lens ?