Table of Contents

## HOW IJMB PHYSICS ALT_A 2A QUESTIONS PRACTICAL WILL COME OUT

*USE THE DIAGRAM AS A GUIDE TO CARRY OUT THE FOLLOWING EXPERIMENT*

📌 Trace the outline ABCD of the rectangular glass prism on the drawing paper provided.

📌 Remove the Prism. Select a point N on AB such that AN is about one quarter of AB.

📌 Draw the normal LMN. Also draw a line RN to make an angle ∅° 75° with AB at N

📌 Fix two pins at P1 and P2 on line RN. Replace the prism on its outline.

📌 Fix two other pins at P3 and P4 such that they appear to be in a straight line with the image of the pins at P1 and P2 when viewed through the prism from side DC.

📌 Remove the Prism and the pins at P3 and P4. Draw a line to join P3 and P4

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📌 Produce line P4 P3 to meet the DC at O. Draw a line to join NO.

📌 Evaluate ∅ = MO/NO and Cos∅

📌 You will be given some values to find e.g. 30, 65, 100, and so on. Tabulate the values plot a graph vertical and horizontal determine the slope on the graph

### 📌 Note the precautions below👇🏿👇🏿

1. I ensured that pins are vertically erect

2. I ensured that pins are reasonably spaced

3. Ensured neat traces

### Some Questions that are likely to come out 📌

I. Explain the term refractive index and give the mathematical expression for it in terms of wavelength.

II. State the conditions necessary for total internal reflection to occur for a given pair of media.

III. State Snell’s law of refraction

📌📌📌

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