Optical Equipment

Optical Instruments

7.2

Optical Instruments

1. Formation of the final image by a microscope

Image position and characteristics formed by the objective lens and eyepiece of a microscope

	Object is between F and the optical centre
Image position	Image is further than F
Image characteristics	Virtual Upright Magnified

Magnifying Power of Microscope

Magnifying power of objective lens X Magnifying power of eyepience

2. Formation of the final image by a telescope

Image position and characteristics formed by the objective lens and eyepiece of a telescope

	Objective at infinity
Image position	Image at F
Image characteristics	Real Inverted Diminished

The distance between the objective lens and eyepiece

\( f_o + f_e\)

where \(f_o\) = focal length of objective lens,

\(f_e\) = focal length of eyepiece

3. Application of lenses in optical instruments