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Answer to Question #61515 in Other Physics for hi

Question #61515

10 Which of these may NOT be a useful apparatus in an optical experiment?
optical pins
lenses
protractor
crocodile clip
11 Refraction is a measure of the ------------ as a wave passes from medium to another
velocity
frequency
wavefront
displacement
12 The image of an object is found to be upright and reduced in size. What type of mirror is used to produce such an image?
Concave
Convex
Both mirrors
None of the above
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