A teacher asked four students to record the observations of the experiment on tracing the path of a ray of light through a rectangular glass slab. The students recorded their observations under the following headings:
(1) Angle of incidence, Angle of refraction, Angle of reflection
(2) Angle of incidence, Angle of deviation, Angle of emergence
(3) Angle of incidence, Angle of reflection, Angle of emergence
(4) Angle of incidence, Angle of refraction, Angle of emergence
The correct observations were recorded by the student:
(1) A
(2) B
(3) C
(4) D

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Solution

When a light ray is passed through a rectangular glass slab, it suffers refraction and bends towards the normal. The same exits from the slab by bending away from the normal and becomes parallel to the incident ray. So, to trace the path of the light ray through a rectangular glass slab, we must observe the angle of incidence, angle of refraction, and the angle of emergence.

Hence, the correct answer is option 4.

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Similar questions

Q. In an experiment to study the refraction of light through a rectangular glass slab, a student measured the angle of incidence, angle of refraction and the angle of emergence. The student lost the reading of angle of incidence but noted the readings of angle of refraction to be 35° and angle of emergence to be 65°. The angle of incidence is likely to be:
(1) 45°
(2) 55°
(3) 35°
(4) 65°

Q. A student performed the experiment of glass slab and with different angles of incidence measured the angles of refraction and emergence in each case. He then recorded his observations as given in the table.

The correct observation is

S. No.	Angle of incidence	Angle of refraction	Angle of emergence
A B C D	30° 40° 50° 60°	25° 42° 50° 60°	30° 40° 50° 62°

(1) A
(2) B
(3) C
(4) D

Q. A student traces the path of a ray of light passing through a rectangular glass slab and marks the angle of incidence i, angle of refraction r and angle of emergence e, as shown. The correctly marked angle(s) is /are:

Q. After tracing the path of rays of light through a glass slab for three different angles of incidence, a student measured the corresponding values angle of refraction r and angle of emergence e and recorded them in the table given below:

S.No.	$∠ i$	$∠ r$	$∠ e$
I	$30^{o}$	$20^{o}$	$31^{o}$
II	$40^{o}$	$25^{o}$	$40^{o}$
III	$50^{o}$	$31^{o}$	$49^{o}$

The correct observations are:

Rahim recorded the following sets of observations while tracing the path of a ray of light passing through a rectangular glass slab for different angles of incidence.

$S.No.Angle of incidenceAngle of refractionAngle of emergenceI45∘41∘45∘II40∘38∘38∘III45∘41∘40∘IV41∘45∘41∘$

The correct observation is recorded at serial number:

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