The focal length of objective lens of a telescope is 30 cm and that of its eye lens is 3 cm. It is focused on a scale 2 metre distant from it. The distance of objective lens from eye lens to see with relaxed eye is:

33 cm

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38.3 cm

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40.3 cm

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65.3 cm

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Solution

The correct option is B
38.3 cm

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The focal length of objective lens of a telescope is 30 cm and that of its eye lens is 3 cm. It is focused on a scale 2 metre distant from it. The distance of objective lens from eye lens to see with relaxed eye is:

The correct option is B 38.3 cm

The correct option is B
38.3 cm