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a) You can make a hole on a paper with sunlight using mom's 2.25 D reading...

a) You can make a hole on a paper with sunlight using mom's 2.25 D reading glasses. What is the focal length of those reading glasses?.

b) What is the index of refraction of a substance that has a critical angle of 69° when immersed in water ? Note that the refractive index of water is 1.33.

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Answer #1

D=2.25 : f= m 2:25 loo = =44.44 2.25 6 44.4 cm @ here critical angle = 690 nsino = 1:33 Singoo In 1:33 Sin = 1:33 0.9336 = 14

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