A concave mirror has a focal length of 20 cm. What is the magnification if the object's distance is 100 cm?

a. 1/2
b. 1/4
c. ?2
d. 4
e. ?1/4


e

Physics & Space Science

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Light will pass through a pair of Polaroids when their axes are

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A spear is thrown by you at a very high speed. As it passes, you measure its length at 1?2 its normal length. From this you conclude that the moving spear's mass must be

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