Compound Microscope

Compound Microscope:

For higher magnification, a microscope can be used, which in its simplest form consists of two converging lenses-one of very short focal length called objective and the other of a longer focal length called eyepiece.

The object distance is so adjusted that the image formed by the objective is placed between the eyepiece lens and its focal point, due to which a virtual magnified image is formed by the eyepiece.

Magnification = (magnification of objective) × (magnification of eyepiece)

m = m_o × m_e 

Where , m_o = magnification by objective

m_e = magnification by the eye piece

$ \displaystyle m_e = (1 + \frac{D}{f_e} ) $

and , $ \displaystyle m_o = -\frac{v_o}{u_o} $

Hence , $ \displaystyle m = -\frac{v_o}{u_o} (1 + \frac{D}{f_e}) $

Also Read :

Reflection of Light at a Plane Surface Reflection at Spherical Surface & Mirror Formula Lateral Magnification Refraction of Light , Laws of Refraction , Relation between real and apparent depth Refraction through Number of media Total internal reflection Refraction through a prism Angle of minimum deviation & Prism Formula Refraction at Curved surface Lens maker’s formula Combinations of Lenses Simple Magnifier Telescope

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