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  • What is the difference in the construction of an astronomical telescope and a compound microscope ? The focal lengths of the objective and eyepiece of a compound microscope are 1·25 cm and 5·0 cm, respectively. Find the position of the ob

What is the difference in the construction of an astronomical telescope and a compound microscope ? The focal lengths of the objective and eyepiece of a compound microscope are 1·25 cm and 5·0 cm, respectively. Find the position of the object relative to the objective in order to obtain an angular magnification of 30 when the final image is formed at the near point.

 

 

Answers (1)

The aperture of telescope objective lens is large whereas the aperture of a microscope objective is small 
fo>fein telescope
fo<fe in microscope

\\m=m_o\times m_e

\\m_e=1+\frac{D}{f_e}\\=1+25/5=6\\m_o=v/u=-5\\v=-5u\\u=-u_0\\v=5u_0\\1/f=1/v -1/u\\1/1.25=1/5u_0+1/u_0\\u_0=1.5cm

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