Focal length of objective lens and eyepiece of an astronomical telescope are 100cm and 2cm respectively. Find the angular magnification produced in the case of normal adjustment:
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Solution
Given, f0=100cm and fe=2cm
In case of normal adjustment, the angular magnification is given by,
m=−f0fe=−1002=−50
∴|m|=50
Hence, (B) is the correct answer.
Key Concept:
1. In case of normal adjustment, final image obtained is at infinity.
2. Negative sign in the angular magnification represent that the final image is inverted.