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Question

A distant object is viewed with a relaxed eye with the help of a small Galilean telescope having an objective of focal length 12 cm and an eyepiece of focal length 3cm.

A
The distance between objective and eyepiece lens is 9 cm
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B
The distance between objective and eyepiece lens is 15 cm
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C
The image of the object is inverted
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D
The angular magnification of the object is +4
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Solution

The correct option is A The distance between objective and eyepiece lens is 9 cm
We know magnification power of galilean telescope =fofe[1feD] where fofe are the focal length of objective and eyepiece respectively and D= distance between foandfe= 123=9cm
Putting the above mentioned values we get
Magnification M
=123[139]=83

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