While tracing the path of a ray of light passing through a rectangular glass slab a student tabulated his observations. If in his experiment for two readings he takes two values of \angle i as 40 ^° and 50^° , what should be the correct values of \angle e and \angle r in eachcase ?

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While tracing the path of a ray of light passing through a rectangular glass slab a student tabulated his observations as given below:
$\begin{matrix} S . N O . & ∠ i & ∠ r & ∠ e I & 60^{\circ} & 39^{\circ} & 61^{\circ} I I & 50^{\circ} & 36^{\circ} & 51^{\circ} I I I & 40^{\circ} & 28^{\circ} & 39^{\circ} I V & 30^{\circ} & 20^{\circ} & 31^{\circ} \end{matrix}$

The correct observation is:

Q. After tracing the path of a ray of light passing through a rectangular glass slab for four different values of the angle of incidence, a student reported his observations in tabular form as given below :

S.No	<i	<r	< e
I	$30^{0}$	$19^{0}$	$29^{0}$
II	$40^{0}$	$28^{0}$	$40^{0}$
III	$50^{0}$	$36^{0}$	$50^{0}$
IV	$60^{0}$	$40^{0}$	$59^{0}$

The best observation is :

Q. A student performs the experiment on tracing the path of a ray of light passing through a rectangular glass slab for different angles of incidence. He measures the angle of incidence ∠i, angle of refraction ∠r and angle of emergence ∠e for all his observations. He would find that in all cases:
(1) ∠i is more than ∠r but (nearly) equal to ∠e
(2) ∠i is less than ∠r but (nearly equal to ∠e
(3) ∠i s more than ∠e but (nearly) equal to ∠r
(4) ∠i is less than ∠e but (nearly) equal to ∠r

Q. A student very cautiously traces the path of a ray through a glass slab for different values of the angle of incidence

(∠ i)

. He then measures the corresponding values of the angle of refraction

(∠ r)

and the angle of emergence

(∠ e)

for every value of the angle of incidence. On analysing these measurements of angles, his conclusion would be

For students P, Q, R and S traced the path of a ray of light passing through a glass slab for an angle of incidence $40^{\circ}$ and measured the angle of refraction. The values as measured them were $18^{\circ}; 22^{\circ}; 25^{\circ}$ and $30^{\circ}$ respectively. The student who has performed the experiment methodically is

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