Optical Instruments

Optical Instruments

7.2

Optical Instruments

Application of lenses in optical instruments

Formation of the final image by a microscope

	Object is between F and 2F
Image position	Image is further than 2F
Image characteristics	Real Inverted Magnified

	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 eyepiece

Formation of the final image by a telescope

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

	Object at F
Image position	Image at infinity
Image characteristics	Virtual Upright Magnified

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

Optical Instruments

7.2

Optical Instruments

Application of lenses in optical instruments

Formation of the final image by a microscope

	Object is between F and 2F
Image position	Image is further than 2F
Image characteristics	Real Inverted Magnified

	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 eyepiece

Formation of the final image by a telescope

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

	Object at F
Image position	Image at infinity
Image characteristics	Virtual Upright Magnified

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