Question

5.
A student carries out the experiment of tracing the path of a ray of liflir through a rectangular
glass slab, for two different values of angle of incidence: °i= 30° and °i = 45°. The set of
values of the angle of refraction (°r)and the angle of emergence (°e). she is likely to observa
in the two cases, are:
a) (Zr = 30°. Ze = 20°) and [_r = 250 b) [Ar = 20°. 24 = 30° and [.21 = 45.
* )
Le = 45°
e = 28°)
0 [Zr = 30° Le = 20°) and I r = 45°
d) [_r= 20, 2e = 30') and = 25°
e-- 45°​

Answer 1

Answer:

Please answer fast!!!

A School organised a camp for training students for athletic meet. The condition for selection was that the weight of a student should be 45-55 kg. For this purpose the weights of 30 students of Class-Vill were taken and recorded as follows (in kg)-

42, 56, 64, 47, 54, 66, 57, 58, 44, 50, 49, 59, 62, 70, 40, 56, 56, 56, 43, 47, 60, 63, 49, 54, 58 45, 47, 49, 64, 54

(a) Prepare a frequency distribution and draw a histogram for the above data.

(b) In what weight range do most students lie?

(c) How many students got selected for the training?

(d) What percentage of students weigh more than 55kg?

Answer 2

Answer:

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Please thanks to my answer.

Explanation:

As the incident ray is parallel to the emergent ray, thus incidence angle is equal to angle of emergence i.e ∠i=∠e

Also the ray travelling from rarer medium (air) to the denser medium (glass slab) slightly bends towards the normal after refraction, thus angle of refraction is smaller than angle of incidence i.e ∠r<∠i

⟹ ∠i=∠e>∠r