In the experiment on tracing the path of a ray of light passing through a rectangular glass slab, the correct setting of the protractor (D), for measuring the angle of incidence (∠i), and the angle of emergence (∠e) correspond, respectively, to diagrams:

(1) K and M
(2) K and N
(3) L and M
(4) L and N

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Solution

The angle of incidence is given by the angle between the incident ray and the normal and the angle of emergence is given by the angle between the emergent ray and the normal to the slab. According to this, the correct diagrams for measurement of the angle of incidence and angle of emergence are K and M respectively.

Hence, the correct answer is option 1.

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Similar questions

Q. In an experiment to trace the path of a ray of light passing through a rectangular glass slab, four students measured the angles of incidence (i), angles of refraction (r) and angles of emergence (e) as shown in the diagrams:

The correct measurement is given in the diagram:
(1) A
(2) B
(3) C
(4) D

Q. In your laboratory, you trace the path of light rays through a glass slab for different values of angle of incidence

(∠ i)

and in each case, measure the values of the corresponding angle of refraction

(∠ r)

and angle of emergence

(∠ e)

. Based on your observations, the correct conclusion is

Q.
A student does the experiment on tracing the path of a ray of light passing through a rectangular glass slab for different angles of incidence. He can get a correct measure of the angle of incidence and the angle of emergence by following the labelling indicated in figure:

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

A student traces the path of a ray of white light through a rectangular glass slab and marks, the angles of incidence $(∠ i)$ refraction $(∠ r)$ and emergence $(∠ e)$ as shown. Which angle or angles has he not marked correctly?

Q. A student traces the path of a ray of light passing through a rectangular glass slab for three different values of angle of incidence (∠i) namely 30°, 45° and 60°. He extends the direction of incident ray by a dotted line and measures the perpendicular distance 'l' between the extended incident ray and the emergent ray. He will observe that:

(1) 'l' keeps on increasing with increase in angle of incidence
(2) 'l' keeps on decreasing with increase in angle of incidence
(3) 'l' remains the same for all three angles of incidence.
(4) 'l' is the maximum for ∠i = 45° and is less than this value both for ∠i = 30° and ∠i = 60°

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