light Flashcards

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1
Q

first law of reflection

A

incident ray, reflected ray and normal at the point of incidence all lie in the same plane

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2
Q

second law of reflection

A

angle of incidence is equal to angle of reflection (i=r)

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3
Q

refraction

A

bending of light as light passes from one optical medium to another

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4
Q

first law of refraction

A

incident ray, refracted ray and normal all lie in the same plane

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5
Q

second law of refraction
snell’s law

A

for two given media the ratio of the sine of angle of incidence to the sine of angle of refraction is a constant (n=sin i/sin r)

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6
Q

refractive index (n)

A

ratio of speed of light in vacuum to the speed of light in the medium

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7
Q

critical angle (c)

A

angle of incidence in an optically denser medium for which angle of refraction in the optically less dense medium is 90 degrees

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8
Q

total internal reflection

A

complete reflection of a light ray inside an optically denser medium at its boundary with an optically less dense medium

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9
Q

focal length

A

distance between the optical centre and the focal point

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