Q20 of 70 Page 11

Which of the two, objective or eye-piece, of a telescope has a large aperture? Give reason for your answer.

The objective lens of a telescope has a large aperture, because it can gather more light from the distant object and form a bright image of the distant object.

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18 If we need magnification of 375 from a microscope of tube length 15 cm and objective of focal length 0.5 cm, what focal length of eye-piece should we use? 19 If focal length of the objective and eye-piece of a telescope are 10 cm and 4 cm respectively, what will be its magnifying power in
(i) normal adjustments,
(ii) adjustment where image of distance object is formed at D? Given D = 25 cm. 21 What are the common defects of vision that can be corrected by the use of suitable eyeglasses or spectacles? 22 What property of the eye is the principle of motion, pictures?