Question

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Ray Incident on:	Flat Surface		Curved Surface
Angle of:	Incidence1	Refraction1	Incidence2	Refraction2
	0	0	0	0
	10	7	10	9
	20	13	20	24
	30	19	30	42
	40	26	40	63
	50	31	50	44
	60	36	60	55
	70	39	70	66
	80	42	80	77
	90	90	90	90

Total Internal Reflection

Without moving the Ray Table or the Cylindrical Lens, notice that not all of the light in the incident ray is refracted. Part of the light is also reflected.

➀ From which surface of the lens does reflection primarily occur? ___________________ ________________________________________________________________.

➁ Is there a reflected ray for all angles of incidence? (Use the Viewing Screen to detect faint rays.)

_________________________________________________________________ ________________________________________________________________.

➂ Are the angles for the reflected ray consistent with the Law of Reflection? __________ ________________________________________________________________.

➃ Is there a refracted ray for all angles of incidence?____________________________ ________________________________________________________________.

➄ How do the intensity of the reflected and refracted rays vary with the angle of incidence?

________________________________________________________________.

➅ At what angle of refraction is all the light reflected (no refracted ray)? ______________

Answer 1

From which surface of the lens does reflection primarily occur

on the flat side

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Is there a reflected ray for all angles of incidence

yes, for all angle of incidences, we can see a reflected ray

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Are the angles for the reflected ray consistent with the Law of Reflection

Yes, the reflected ray is consistent with the Law of Reflection

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Is there a refracted ray for all angles of incidence

No, after some angle , the light will undergo total internal reflection

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How do the intensity of the reflected and refracted rays vary with the angle of incidence

The intensity of refracted rays decreases when the angle of incidence increases, but the intensity of reflected rays increase.

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